Revert of Remove calls to MessageLoop::current() in content.

content/renderer/render_thread_impl.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 "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 2022 matching lines @@
       // Purge Skia font cache, by setting it to 0 and then again to the
       // previous limit.
       size_t font_cache_limit = SkGraphics::SetFontCacheLimit(0);
       SkGraphics::SetFontCacheLimit(font_cache_limit);
     }
   }
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 RenderThreadImpl::GetFileThreadMessageLoopProxy() {
-  DCHECK(message_loop()->task_runner()->BelongsToCurrentThread());
+  DCHECK(message_loop() == base::MessageLoop::current());
   if (!file_thread_) {
     file_thread_.reset(new base::Thread("Renderer::FILE"));
     file_thread_->Start();
   }
   return file_thread_->task_runner();
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 RenderThreadImpl::GetMediaThreadTaskRunner() {
-  DCHECK(message_loop()->task_runner()->BelongsToCurrentThread());
+  DCHECK(message_loop() == base::MessageLoop::current());
   if (!media_thread_) {
     media_thread_.reset(new base::Thread("Media"));
     media_thread_->Start();
 
 #if defined(OS_ANDROID)
     renderer_demuxer_ = new RendererDemuxerAndroid();
     AddFilter(renderer_demuxer_.get());
 #endif
   }
   return media_thread_->task_runner();
@@ skipping 142 matching lines @@
       v8_memory_pressure_level == v8::MemoryPressureLevel::kCritical)
     v8_memory_pressure_level = v8::MemoryPressureLevel::kModerate;
 
   blink::mainThreadIsolate()->MemoryPressureNotification(
       v8_memory_pressure_level);
   blink::MemoryPressureNotificationToWorkerThreadIsolates(
       v8_memory_pressure_level);
 }
 
 }  // namespace content