Make DidChangeView async again

The webkit bug has been fixed since then, so it works now.

BUG=none
TEST=youtube

Review URL: http://codereview.chromium.org/6706012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@80189 0039d316-1c4b-4281-b951-d872f2087c98

ppapi/proxy/ppapi_messages.h

@@ -174,9 +174,7 @@ IPC_SYNC_MESSAGE_ROUTED3_1(PpapiMsg_PPPInstance_DidCreate,
                            PP_Bool /* result */)
 IPC_MESSAGE_ROUTED1(PpapiMsg_PPPInstance_DidDestroy,
                     PP_Instance /* instance */)
-// TODO(piman): DidChangeView should be async, but doing so causes an issue with
-// webkit and accelerated compositing. Turn back to async once this is fixed.
-IPC_SYNC_MESSAGE_ROUTED3_0(PpapiMsg_PPPInstance_DidChangeView,
+IPC_MESSAGE_ROUTED3(PpapiMsg_PPPInstance_DidChangeView,
                     PP_Instance /* instance */,
                     PP_Rect /* position */,
                     PP_Rect /* clip */)