chrome: Cleanup class/struct forward declarations

chrome/browser/ui/webui/invalidations_message_handler.h

Index: chrome/browser/ui/webui/invalidations_message_handler.h
diff --git a/chrome/browser/ui/webui/invalidations_message_handler.h b/chrome/browser/ui/webui/invalidations_message_handler.h
index 82c3809cfc2405f95dec3d731fa8fc8c96a6566e..8d94440be975515820e4d7128d596edde8fa9a44 100644
--- a/chrome/browser/ui/webui/invalidations_message_handler.h
+++ b/chrome/browser/ui/webui/invalidations_message_handler.h
@@ -15,16 +15,10 @@
 #include "components/invalidation/public/invalidation_util.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
-class Profile;
-
 namespace invalidation {
 class InvalidationLogger;
 }  // namespace invalidation
 
-namespace syncer {
-class InvalidationHandler;
-}  // namespace syncer
-
 // The implementation for the chrome://invalidations page.
 class InvalidationsMessageHandler
     : public content::WebUIMessageHandler,