ash: Clean up some uber-tray related code.

Rename the various 'Controller's to 'Observer's, because that makes more sense,
and move these observers from Shell into SystemTray.

BUG=110130
TEST=none

Review URL: https://chromiumcodereview.appspot.com/9702037

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@126758 0039d316-1c4b-4281-b951-d872f2087c98

16 files changed, 111 insertions, 107 deletions

diff --git a/ash/ash.gyp b/ash/ash.gyp
index a2b9ea68..a5ee083 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -109,18 +109,18 @@
         'shell_window_ids.h',
         'status_area/status_area_view.cc',
         'status_area/status_area_view.h',
-        'system/audio/audio_controller.h',
+        'system/audio/audio_observer.h',
         'system/audio/tray_volume.cc',
         'system/audio/tray_volume.h',
-        'system/brightness/brightness_controller.h',
+        'system/brightness/brightness_observer.h',
         'system/brightness/brightness_control_delegate.h',
         'system/brightness/tray_brightness.cc',
         'system/brightness/tray_brightness.h',
-        'system/network/network_controller.h',
+        'system/network/network_observer.h',
         'system/network/tray_network.cc',
         'system/network/tray_network.h',
         'system/power/date_format_observer.h',
-        'system/power/power_status_controller.h',
+        'system/power/power_status_observer.h',
         'system/power/power_supply_status.cc',
         'system/power/power_supply_status.h',
         'system/power/tray_power_date.cc',
@@ -139,7 +139,7 @@
         'system/user/login_status.h',
         'system/user/tray_user.cc',
         'system/user/tray_user.h',
-        'system/user/update_controller.h',
+        'system/user/update_observer.h',
         'tooltips/tooltip_controller.cc',
         'tooltips/tooltip_controller.h',
         'volume_control_delegate.h',
diff --git a/ash/shell.cc b/ash/shell.cc
index 808771d..d3a794a 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -19,7 +19,7 @@
 #include "ash/system/audio/tray_volume.h"
 #include "ash/system/brightness/tray_brightness.h"
 #include "ash/system/network/tray_network.h"
-#include "ash/system/power/power_status_controller.h"
+#include "ash/system/power/power_status_observer.h"
 #include "ash/system/power/tray_power_date.h"
 #include "ash/system/settings/tray_settings.h"
 #include "ash/system/tray/system_tray_delegate.h"
@@ -340,12 +340,6 @@ Shell::Shell(ShellDelegate* delegate)
       screen_(new ScreenAsh(root_window_.get())),
       root_filter_(NULL),
       delegate_(delegate),
-      audio_controller_(NULL),
-      brightness_controller_(NULL),
-      date_format_observer_(NULL),
-      network_controller_(NULL),
-      power_status_controller_(NULL),
-      update_controller_(NULL),
       shelf_(NULL),
       desktop_background_mode_(BACKGROUND_IMAGE),
       root_window_layout_(NULL),
@@ -501,12 +495,12 @@ void Shell::Init() {
     internal::TrayPowerDate* tray_power_date = new internal::TrayPowerDate();
     internal::TrayNetwork* tray_network = new internal::TrayNetwork;
     internal::TrayUser* tray_user = new internal::TrayUser;
-    audio_controller_ = tray_volume;
-    brightness_controller_ = tray_brightness;
-    date_format_observer_ = tray_power_date;
-    network_controller_ = tray_network;
-    power_status_controller_ = tray_power_date;
-    update_controller_ = tray_user;
+    tray_->audio_controller_ = tray_volume;
+    tray_->brightness_controller_ = tray_brightness;
+    tray_->date_format_observer_ = tray_power_date;
+    tray_->network_controller_ = tray_network;
+    tray_->power_status_controller_ = tray_power_date;
+    tray_->update_controller_ = tray_user;
 
     tray_->AddTrayItem(tray_user);
     tray_->AddTrayItem(new internal::TrayEmpty());
diff --git a/ash/shell.h b/ash/shell.h
index bb0998a..8a0f615 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -40,20 +40,14 @@ class Widget;
 namespace ash {
 
 class AcceleratorController;
-class AudioController;
-class BrightnessController;
-class DateFormatObserver;
 class Launcher;
 class NestedDispatcherController;
-class NetworkController;
 class PowerButtonController;
-class PowerStatusController;
 class ScreenAsh;
 class ShellDelegate;
 class ShellObserver;
 class SystemTrayDelegate;
 class SystemTray;
-class UpdateController;
 class VideoDetector;
 class WindowCycleController;
 
@@ -194,24 +188,6 @@ class ASH_EXPORT Shell {
   internal::FocusCycler* focus_cycler() {
     return focus_cycler_.get();
   }
-  AudioController* audio_controller() const {
-    return audio_controller_;
-  }
-  BrightnessController* brightness_controller() const {
-    return brightness_controller_;
-  }
-  DateFormatObserver* date_format_observer() const {
-    return date_format_observer_;
-  }
-  NetworkController* network_controller() const {
-    return network_controller_;
-  }
-  PowerStatusController* power_status_controller() const {
-    return power_status_controller_;
-  }
-  UpdateController* update_controller() const {
-    return update_controller_;
-  }
 
   ShellDelegate* delegate() { return delegate_.get(); }
   SystemTrayDelegate* tray_delegate() { return tray_delegate_.get(); }
@@ -292,14 +268,6 @@ class ASH_EXPORT Shell {
   scoped_ptr<WindowCycleController> window_cycle_controller_;
   scoped_ptr<internal::FocusCycler> focus_cycler_;
 
-  // These controllers are not owned by the shell.
-  AudioController* audio_controller_;
-  BrightnessController* brightness_controller_;
-  DateFormatObserver* date_format_observer_;
-  NetworkController* network_controller_;
-  PowerStatusController* power_status_controller_;
-  UpdateController* update_controller_;
-
   // An event filter that pre-handles all key events to send them to an IME.
   scoped_ptr<internal::InputMethodEventFilter> input_method_filter_;
 
diff --git a/ash/system/audio/audio_controller.h b/ash/system/audio/audio_observer.h
index 682766b..ebf5adb 100644
--- a/ash/system/audio/audio_controller.h
+++ b/ash/system/audio/audio_observer.h
@@ -2,20 +2,20 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SYSTEM_AUDIO_AUDIO_CONTROLLER_H_
-#define ASH_SYSTEM_AUDIO_AUDIO_CONTROLLER_H_
+#ifndef ASH_SYSTEM_AUDIO_AUDIO_OBSERVER_H_
+#define ASH_SYSTEM_AUDIO_AUDIO_OBSERVER_H_
 
 #include "ash/ash_export.h"
 
 namespace ash {
 
-class ASH_EXPORT AudioController {
+class ASH_EXPORT AudioObserver {
  public:
-  virtual ~AudioController() {}
+  virtual ~AudioObserver() {}
 
   virtual void OnVolumeChanged(float percent) = 0;
 };
 
 }  // namespace ash
 
-#endif  //ASH_SYSTEM_AUDIO_AUDIO_CONTROLLER_H_
+#endif  //ASH_SYSTEM_AUDIO_AUDIO_OBSERVER_H_
diff --git a/ash/system/audio/tray_volume.h b/ash/system/audio/tray_volume.h
index 48168ec..8a2f0e3 100644
--- a/ash/system/audio/tray_volume.h
+++ b/ash/system/audio/tray_volume.h
@@ -6,7 +6,7 @@
 #define ASH_SYSTEM_AUDIO_TRAY_VOLUME_H_
 #pragma once
 
-#include "ash/system/audio/audio_controller.h"
+#include "ash/system/audio/audio_observer.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "base/memory/scoped_ptr.h"
 
@@ -18,7 +18,7 @@ class VolumeView;
 }
 
 class TrayVolume : public SystemTrayItem,
-                   public AudioController {
+                   public AudioObserver {
  public:
   TrayVolume();
   virtual ~TrayVolume();
@@ -32,7 +32,7 @@ class TrayVolume : public SystemTrayItem,
   virtual void DestroyDefaultView() OVERRIDE;
   virtual void DestroyDetailedView() OVERRIDE;
 
-  // Overridden from AudioController.
+  // Overridden from AudioObserver.
   virtual void OnVolumeChanged(float percent) OVERRIDE;
 
   scoped_ptr<tray::VolumeView> volume_view_;
diff --git a/ash/system/brightness/brightness_controller.h b/ash/system/brightness/brightness_observer.h
index 51d0d46..0d2c532 100644
--- a/ash/system/brightness/brightness_controller.h
+++ b/ash/system/brightness/brightness_observer.h
@@ -2,20 +2,20 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SYSTEM_BRIGHTNESS_BRIGHTNESS_CONTROLLER_H_
-#define ASH_SYSTEM_BRIGHTNESS_BRIGHTNESS_CONTROLLER_H_
+#ifndef ASH_SYSTEM_BRIGHTNESS_BRIGHTNESS_OBSERVER_H_
+#define ASH_SYSTEM_BRIGHTNESS_BRIGHTNESS_OBSERVER_H_
 
 #include "ash/ash_export.h"
 
 namespace ash {
 
-class ASH_EXPORT BrightnessController {
+class ASH_EXPORT BrightnessObserver {
  public:
-  virtual ~BrightnessController() {}
+  virtual ~BrightnessObserver() {}
 
   virtual void OnBrightnessChanged(float percent, bool user_initiated) = 0;
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_BRIGHTNESS_BRIGHTNESS_CONTROLLER_H_
+#endif  // ASH_SYSTEM_BRIGHTNESS_BRIGHTNESS_OBSERVER_H_
diff --git a/ash/system/brightness/tray_brightness.h b/ash/system/brightness/tray_brightness.h
index ed0f205..b1f2f5d 100644
--- a/ash/system/brightness/tray_brightness.h
+++ b/ash/system/brightness/tray_brightness.h
@@ -6,7 +6,7 @@
 #define ASH_SYSTEM_BRIGHTNESS_TRAY_BRIGHTNESS_H_
 #pragma once
 
-#include "ash/system/brightness/brightness_controller.h"
+#include "ash/system/brightness/brightness_observer.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "base/compiler_specific.h"
 
@@ -18,7 +18,7 @@ class BrightnessView;
 }
 
 class TrayBrightness : public SystemTrayItem,
-                       public BrightnessController {
+                       public BrightnessObserver {
  public:
   TrayBrightness();
   virtual ~TrayBrightness();
@@ -32,7 +32,7 @@ class TrayBrightness : public SystemTrayItem,
   virtual void DestroyDefaultView() OVERRIDE;
   virtual void DestroyDetailedView() OVERRIDE;
 
-  // Overridden from BrightnessController.
+  // Overridden from BrightnessObserver.
   virtual void OnBrightnessChanged(float percent,
                                    bool user_initiated) OVERRIDE;
 
diff --git a/ash/system/network/network_controller.h b/ash/system/network/network_observer.h
index bd8358b..4756db9 100644
--- a/ash/system/network/network_controller.h
+++ b/ash/system/network/network_observer.h
@@ -2,21 +2,21 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SYSTEM_NETWORK_NETWORK_CONTROLLER_H
-#define ASH_SYSTEM_NETWORK_NETWORK_CONTROLLER_H
+#ifndef ASH_SYSTEM_NETWORK_NETWORK_OBSERVER_H
+#define ASH_SYSTEM_NETWORK_NETWORK_OBSERVER_H
 #pragma once
 
 namespace ash {
 
 struct NetworkIconInfo;
 
-class NetworkController {
+class NetworkObserver {
  public:
-  virtual ~NetworkController() {}
+  virtual ~NetworkObserver() {}
 
   virtual void OnNetworkRefresh(const NetworkIconInfo& info) = 0;
 };
 
 }  // namespace ash
 
-#endif  // ASH_SYSTEM_NETWORK_NETWORK_CONTROLLER_H
+#endif  // ASH_SYSTEM_NETWORK_NETWORK_OBSERVER_H
diff --git a/ash/system/network/tray_network.h b/ash/system/network/tray_network.h
index d50f7fb..4d56d6f 100644
--- a/ash/system/network/tray_network.h
+++ b/ash/system/network/tray_network.h
@@ -6,7 +6,7 @@
 #define ASH_SYSTEM_NETWORK_TRAY_NETWORK_H
 #pragma once
 
-#include "ash/system/network/network_controller.h"
+#include "ash/system/network/network_observer.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "base/memory/scoped_ptr.h"
 
@@ -20,7 +20,7 @@ class NetworkTrayView;
 }
 
 class TrayNetwork : public SystemTrayItem,
-                    public NetworkController {
+                    public NetworkObserver {
  public:
   TrayNetwork();
   virtual ~TrayNetwork();
@@ -34,7 +34,7 @@ class TrayNetwork : public SystemTrayItem,
   virtual void DestroyDefaultView() OVERRIDE;
   virtual void DestroyDetailedView() OVERRIDE;
 
-  // Overridden from NetworkController.
+  // Overridden from NetworkObserver.
   virtual void OnNetworkRefresh(const NetworkIconInfo& info) OVERRIDE;
 
   scoped_ptr<tray::NetworkTrayView> tray_;
diff --git a/ash/system/power/power_status_controller.h b/ash/system/power/power_status_observer.h
index 877349c..725d388 100644
--- a/ash/system/power/power_status_controller.h
+++ b/ash/system/power/power_status_observer.h
@@ -2,20 +2,20 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SYSTEM_POWER_POWER_STATUS_CONTROLLER_H_
-#define ASH_SYSTEM_POWER_POWER_STATUS_CONTROLLER_H_
+#ifndef ASH_SYSTEM_POWER_POWER_STATUS_OBSERVER_H_
+#define ASH_SYSTEM_POWER_POWER_STATUS_OBSERVER_H_
 
 namespace ash {
 
 struct PowerSupplyStatus;
 
-class PowerStatusController {
+class PowerStatusObserver {
  public:
-  virtual ~PowerStatusController() {}
+  virtual ~PowerStatusObserver() {}
 
   virtual void OnPowerStatusChanged(const PowerSupplyStatus& status) = 0;
 };
 
 };
 
-#endif  // ASH_SYSTEM_POWER_POWER_STATUS_CONTROLLER_H_
+#endif  // ASH_SYSTEM_POWER_POWER_STATUS_OBSERVER_H_
diff --git a/ash/system/power/tray_power_date.h b/ash/system/power/tray_power_date.h
index 9f4f327..98095f5 100644
--- a/ash/system/power/tray_power_date.h
+++ b/ash/system/power/tray_power_date.h
@@ -7,7 +7,7 @@
 #pragma once
 
 #include "ash/system/power/date_format_observer.h"
-#include "ash/system/power/power_status_controller.h"
+#include "ash/system/power/power_status_observer.h"
 #include "ash/system/tray/system_tray_item.h"
 
 namespace ash {
@@ -20,7 +20,7 @@ class PowerTrayView;
 }
 
 class TrayPowerDate : public SystemTrayItem,
-                      public PowerStatusController,
+                      public PowerStatusObserver,
                       public DateFormatObserver {
  public:
   TrayPowerDate();
@@ -35,7 +35,7 @@ class TrayPowerDate : public SystemTrayItem,
   virtual void DestroyDefaultView() OVERRIDE;
   virtual void DestroyDetailedView() OVERRIDE;
 
-  // Overridden from PowerStatusController.
+  // Overridden from PowerStatusObserver.
   virtual void OnPowerStatusChanged(const PowerSupplyStatus& status) OVERRIDE;
 
   // Overridden from DateFormatObserver.
diff --git a/ash/system/tray/system_tray.cc b/ash/system/tray/system_tray.cc
index 3629a20..39d176b 100644
--- a/ash/system/tray/system_tray.cc
+++ b/ash/system/tray/system_tray.cc
@@ -288,6 +288,12 @@ NetworkIconInfo::~NetworkIconInfo() {
 
 SystemTray::SystemTray()
     : items_(),
+      audio_controller_(NULL),
+      brightness_controller_(NULL),
+      date_format_observer_(NULL),
+      network_controller_(NULL),
+      power_status_controller_(NULL),
+      update_controller_(NULL),
       bubble_(NULL),
       popup_(NULL) {
   container_ = new views::View;
diff --git a/ash/system/tray/system_tray.h b/ash/system/tray/system_tray.h
index 92553c2..20caab2 100644
--- a/ash/system/tray/system_tray.h
+++ b/ash/system/tray/system_tray.h
@@ -16,6 +16,13 @@
 
 namespace ash {
 
+class AudioObserver;
+class BrightnessObserver;
+class DateFormatObserver;
+class NetworkObserver;
+class PowerStatusObserver;
+class UpdateObserver;
+
 class SystemTrayItem;
 
 namespace internal {
@@ -48,7 +55,28 @@ class ASH_EXPORT SystemTray : public views::View,
 
   const std::vector<SystemTrayItem*>& items() const { return items_; }
 
+  AudioObserver* audio_controller() const {
+    return audio_controller_;
+  }
+  BrightnessObserver* brightness_controller() const {
+    return brightness_controller_;
+  }
+  DateFormatObserver* date_format_observer() const {
+    return date_format_observer_;
+  }
+  NetworkObserver* network_controller() const {
+    return network_controller_;
+  }
+  PowerStatusObserver* power_status_controller() const {
+    return power_status_controller_;
+  }
+  UpdateObserver* update_controller() const {
+    return update_controller_;
+  }
+
  private:
+  friend class Shell;
+
   void ShowItems(std::vector<SystemTrayItem*>& items,
                  bool details,
                  bool activate);
@@ -67,6 +95,14 @@ class ASH_EXPORT SystemTray : public views::View,
   // The container for all the tray views of the items.
   views::View* container_;
 
+  // These observers are not owned by the tray.
+  AudioObserver* audio_controller_;
+  BrightnessObserver* brightness_controller_;
+  DateFormatObserver* date_format_observer_;
+  NetworkObserver* network_controller_;
+  PowerStatusObserver* power_status_controller_;
+  UpdateObserver* update_controller_;
+
   // The popup widget and the delegate.
   internal::SystemTrayBubble* bubble_;
   views::Widget* popup_;
diff --git a/ash/system/user/tray_user.h b/ash/system/user/tray_user.h
index 7284701..b37633e 100644
--- a/ash/system/user/tray_user.h
+++ b/ash/system/user/tray_user.h
@@ -7,7 +7,7 @@
 #pragma once
 
 #include "ash/system/tray/system_tray_item.h"
-#include "ash/system/user/update_controller.h"
+#include "ash/system/user/update_observer.h"
 
 namespace ash {
 namespace internal {
@@ -17,7 +17,7 @@ class UserView;
 }
 
 class TrayUser : public SystemTrayItem,
-                 public UpdateController {
+                 public UpdateObserver {
  public:
   TrayUser();
   virtual ~TrayUser();
@@ -31,7 +31,7 @@ class TrayUser : public SystemTrayItem,
   virtual void DestroyDefaultView() OVERRIDE;
   virtual void DestroyDetailedView() OVERRIDE;
 
-  // Overridden from UpdateController.
+  // Overridden from UpdateObserver.
   virtual void OnUpdateRecommended() OVERRIDE;
 
   scoped_ptr<tray::UserView> user_;
diff --git a/ash/system/user/update_controller.h b/ash/system/user/update_observer.h
index ee6f86c..066a7bc 100644
--- a/ash/system/user/update_controller.h
+++ b/ash/system/user/update_observer.h
@@ -2,20 +2,20 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SYSTEM_USER_UPDATE_CONTROLLER_H_
-#define ASH_SYSTEM_USER_UPDATE_CONTROLLER_H_
+#ifndef ASH_SYSTEM_USER_UPDATE_OBSERVER_H_
+#define ASH_SYSTEM_USER_UPDATE_OBSERVER_H_
 
 #include "ash/ash_export.h"
 
 namespace ash {
 
-class ASH_EXPORT UpdateController {
+class ASH_EXPORT UpdateObserver {
  public:
-  virtual ~UpdateController() {}
+  virtual ~UpdateObserver() {}
 
   virtual void OnUpdateRecommended() = 0;
 };
 
 }  // namespace ash
 
-#endif  //ASH_SYSTEM_USER_UPDATE_CONTROLLER_H_
+#endif  //ASH_SYSTEM_USER_UPDATE_OBSERVER_H_
diff --git a/chrome/browser/chromeos/system/ash_system_tray_delegate.cc b/chrome/browser/chromeos/system/ash_system_tray_delegate.cc
index b0b3e56..fe152b2 100644
--- a/chrome/browser/chromeos/system/ash_system_tray_delegate.cc
+++ b/chrome/browser/chromeos/system/ash_system_tray_delegate.cc
@@ -6,14 +6,14 @@
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
-#include "ash/system/audio/audio_controller.h"
-#include "ash/system/brightness/brightness_controller.h"
-#include "ash/system/network/network_controller.h"
+#include "ash/system/audio/audio_observer.h"
+#include "ash/system/brightness/brightness_observer.h"
+#include "ash/system/network/network_observer.h"
 #include "ash/system/power/date_format_observer.h"
-#include "ash/system/power/power_status_controller.h"
+#include "ash/system/power/power_status_observer.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/system_tray_delegate.h"
-#include "ash/system/user/update_controller.h"
+#include "ash/system/user/update_observer.h"
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/chromeos/audio/audio_handler.h"
@@ -273,12 +273,12 @@ class SystemTrayDelegate : public ash::SystemTrayDelegate,
   }
 
   void NotifyRefreshNetwork() {
-    ash::NetworkController* controller =
-        ash::Shell::GetInstance()->network_controller();
-    if (controller) {
+    ash::NetworkObserver* observer =
+        ash::Shell::GetInstance()->tray()->network_controller();
+    if (observer) {
       ash::NetworkIconInfo info;
       info.image = network_icon_->GetIconAndText(&info.description);
-      controller->OnNetworkRefresh(info);
+      observer->OnNetworkRefresh(info);
     }
   }
 
@@ -305,18 +305,18 @@ class SystemTrayDelegate : public ash::SystemTrayDelegate,
   // Overridden from AudioHandler::VolumeObserver.
   virtual void OnVolumeChanged() OVERRIDE {
     float level = AudioHandler::GetInstance()->GetVolumePercent() / 100.f;
-    ash::Shell::GetInstance()->audio_controller()->
+    ash::Shell::GetInstance()->tray()->audio_controller()->
         OnVolumeChanged(level);
   }
 
   // Overridden from PowerManagerClient::Observer.
   virtual void BrightnessChanged(int level, bool user_initiated) OVERRIDE {
-    ash::Shell::GetInstance()->brightness_controller()->
+    ash::Shell::GetInstance()->tray()->brightness_controller()->
         OnBrightnessChanged(level / 100.f, user_initiated);
   }
 
   virtual void PowerChanged(const PowerSupplyStatus& power_status) OVERRIDE {
-    ash::Shell::GetInstance()->power_status_controller()->
+    ash::Shell::GetInstance()->tray()->power_status_controller()->
         OnPowerStatusChanged(power_status);
   }
 
@@ -390,17 +390,17 @@ class SystemTrayDelegate : public ash::SystemTrayDelegate,
         break;
       }
       case chrome::NOTIFICATION_UPGRADE_RECOMMENDED: {
-        ash::UpdateController* controller =
-            ash::Shell::GetInstance()->update_controller();
-        if (controller)
-          controller->OnUpdateRecommended();
+        ash::UpdateObserver* observer =
+            ash::Shell::GetInstance()->tray()->update_controller();
+        if (observer)
+          observer->OnUpdateRecommended();
         break;
       }
       case chrome::NOTIFICATION_PREF_CHANGED: {
         DCHECK_EQ(*content::Details<std::string>(details).ptr(),
                   prefs::kUse24HourClock);
         ash::DateFormatObserver* observer =
-            ash::Shell::GetInstance()->date_format_observer();
+            ash::Shell::GetInstance()->tray()->date_format_observer();
         if (observer)
           observer->OnDateFormatChanged();
         break;