PPAPI: Don't use MessageLoop::current in the plugin process

ppapi/proxy/ppb_image_data_proxy.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/proxy/ppb_image_data_proxy.h"
 
 #include <string.h>  // For memcpy
 
 #include <map>
 #include <vector>
@@ skipping 264 matching lines @@
   CacheMap::iterator found = cache_.find(instance);
   if (found == cache_.end())
     return scoped_refptr<ImageData>();
   return found->second.Get(type, width, height, format);
 }
 
 void ImageDataCache::Add(ImageData* image_data) {
   cache_[image_data->pp_instance()].Add(image_data);
 
   // Schedule a timer to invalidate this entry.
-  base::MessageLoop::current()->PostDelayedTask(
+  PpapiGlobals::Get()->GetMainThreadMessageLoop()->PostDelayedTask(
       FROM_HERE,
       RunWhileLocked(base::Bind(&ImageDataCache::OnTimer,
                                 weak_factory_.GetWeakPtr(),
                                 image_data->pp_instance())),
       base::TimeDelta::FromSeconds(kMaxAgeSeconds));
 }
 
 void ImageDataCache::ImageDataUsable(ImageData* image_data) {
   CacheMap::iterator found = cache_.find(image_data->pp_instance());
   if (found != cache_.end())
@@ skipping 391 matching lines @@
   // still cached in our process, the proxy still holds a reference so we can
   // remove the one the renderer just sent is. If the proxy no longer holds a
   // reference, we released everything and we should also release the one the
   // renderer just sent us.
   dispatcher()->Send(new PpapiHostMsg_PPBCore_ReleaseResource(
       API_ID_PPB_CORE, old_image_data));
 }
 
 }  // namespace proxy
 }  // namespace ppapi