chrome: Cleanup class/struct forward declarations

chrome/browser/renderer_host/chrome_extension_message_filter.h

Index: chrome/browser/renderer_host/chrome_extension_message_filter.h
diff --git a/chrome/browser/renderer_host/chrome_extension_message_filter.h b/chrome/browser/renderer_host/chrome_extension_message_filter.h
index ff79393b4f37cf748851ddaaf8ae5962e8011cae..7602e6e490d541910c1af334d375235c38eeac93 100644
--- a/chrome/browser/renderer_host/chrome_extension_message_filter.h
+++ b/chrome/browser/renderer_host/chrome_extension_message_filter.h
@@ -13,17 +13,12 @@
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
-class GURL;
 class Profile;
 struct ExtensionHostMsg_APIActionOrEvent_Params;
 struct ExtensionHostMsg_DOMAction_Params;
 struct ExtensionMsg_ExternalConnectionInfo;
 struct ExtensionMsg_TabTargetConnectionInfo;
 
-namespace base {
-class FilePath;
-}
-
 namespace extensions {
 class ActivityLog;
 class InfoMap;