chromeos: Simplify how chrome keeps track of caps lock state.

Notable changes:
 * Make caps-lock related tray-item explicitly chromeos-only, since there has
   never been an implementation of CapsLockDelegate for other platforms.
 * As a result, have the tray-item directly communicate with XKeyboard, instead
   of needing the CapsLockDelegate, so delete it.
 * Have the code that needs to know when the caps-lock state changes (e.g.
   TrayCapsLock, SigninScreenHandler) use a pre-target handler on Shell
   and look for VKEY_CAPITAL key-press events. This simplifies the code,
   which currently flows from:
     X11 -> SystemKeyEventListener -> SystemTrayDelegate -> SystemTrayNotifier -> TrayCapsLock
   to:
     X11 -> WindowTreeHost -> TrayCapsLock

BUG=none
R=derat@chromium.org, oshima@chromium.org, yusukes@chromium.org
TBR=nkostylev@chromium.org for c/b/ui/webui/chromeos/login changes

Review URL: https://codereview.chromium.org/192293004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256363 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 0 insertions, 4 deletions

diff --git a/ash/shell_delegate.h b/ash/shell_delegate.h
index 7f27d21..ba28e0c 100644
--- a/ash/shell_delegate.h
+++ b/ash/shell_delegate.h
@@ -40,7 +40,6 @@ class KeyboardControllerProxy;
 namespace ash {
 
 class AccessibilityDelegate;
-class CapsLockDelegate;
 class MediaDelegate;
 class NewWindowDelegate;
 class WindowTreeHostFactory;
@@ -105,9 +104,6 @@ class ASH_EXPORT ShellDelegate {
   // Creates a user wallpaper delegate. Shell takes ownership of the delegate.
   virtual UserWallpaperDelegate* CreateUserWallpaperDelegate() = 0;
 
-  // Creates a caps lock delegate. Shell takes ownership of the delegate.
-  virtual CapsLockDelegate* CreateCapsLockDelegate() = 0;
-
   // Creates a session state delegate. Shell takes ownership of the delegate.
   virtual SessionStateDelegate* CreateSessionStateDelegate() = 0;