components: Move PrefRegistrySyncable into user_prefs namespace.

chrome/browser/ui/cocoa/extensions/browser_actions_controller.h

Index: chrome/browser/ui/cocoa/extensions/browser_actions_controller.h
diff --git a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.h b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.h
index 7465d2da26bd8703508bc4d63381c8c06a95f14c..f24a8d1d052afd8710fafeae4bfbf426fde61cfa 100644
--- a/chrome/browser/ui/cocoa/extensions/browser_actions_controller.h
+++ b/chrome/browser/ui/cocoa/extensions/browser_actions_controller.h
@@ -17,13 +17,16 @@ class Browser;
 class ExtensionToolbarModel;
 class ExtensionServiceObserverBridge;
 @class MenuButton;
-class PrefRegistrySyncable;
 class Profile;
 
 namespace extensions {
 class Extension;
 }
 
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
 // Sent when the visibility of the Browser Actions changes.
 extern NSString* const kBrowserActionVisibilityChangedNotification;
 
@@ -106,7 +109,7 @@ extern NSString* const kBrowserActionVisibilityChangedNotification;
 - (BOOL)chevronIsHidden;
 
 // Registers the user preferences used by this class.
-+ (void)registerUserPrefs:(PrefRegistrySyncable*)prefs;
++ (void)registerUserPrefs:(user_prefs::PrefRegistrySyncable*)prefs;
 
 @end  // @interface BrowserActionsController