Move functions for controlling Caps Lock to CapsLockDelegate from SystemTrayDelegate.

ash/shell_delegate.h

Index: ash/shell_delegate.h
diff --git a/ash/shell_delegate.h b/ash/shell_delegate.h
index 7b7d0971e628d1b3a88dcb25a5960c76c149d29a..00dc54498d5ca3153425df96b364535303e73eaf 100644
--- a/ash/shell_delegate.h
+++ b/ash/shell_delegate.h
@@ -29,6 +29,7 @@ class Widget;
 
 namespace ash {
 
+class CapsLockDelegate;
 class LauncherDelegate;
 class LauncherModel;
 struct LauncherItem;
@@ -129,6 +130,9 @@ 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 user action client. Shell takes ownership of the object.
   virtual aura::client::UserActionClient* CreateUserActionClient() = 0;