Remove content::NotificationObserver dependency from most Prefs code.

Instead of using content::NotificationObserver, introduce specific
type-safe observer classes and update users to use them.  In a very
large number of cases this was the users' only reason for being a
content::NotificationObserver and they would have a lot of
boiler-plate code such as a DCHECK on the notification type and
unpacking of the generic NotificationDetails types, so this change
removes a bunch of boilerplate and introduces more type safety.

This is part of enabling more of the Prefs code to live in
base/prefs/.

TBR=ben@chromium.org,brettw@chromium.org
BUG=155525


Review URL: https://chromiumcodereview.appspot.com/11345008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@165414 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 4 insertions, 4 deletions

diff --git a/chrome/browser/chromeos/proxy_config_service_impl.h b/chrome/browser/chromeos/proxy_config_service_impl.h
index 92df0d0..78026ba 100644
--- a/chrome/browser/chromeos/proxy_config_service_impl.h
+++ b/chrome/browser/chromeos/proxy_config_service_impl.h
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/basictypes.h"
+#include "base/prefs/public/pref_observer.h"
 #include "base/values.h"
 #include "chrome/browser/api/prefs/pref_member.h"
 #include "chrome/browser/chromeos/cros/network_library.h"
@@ -213,10 +214,9 @@ class ProxyConfigServiceImpl
 #endif  // defined(UNIT_TEST)
 
  private:
-  // content::NotificationObserver implementation.
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
+  // PrefObserver implementation.
+  virtual void OnPreferenceChanged(PrefServiceBase* service,
+                                   const std::string& pref_name) OVERRIDE;
 
   // Called from the various UISetProxyConfigTo*.
   void OnUISetProxyConfig();