Remove all remaining traces of MessageLoopProxy.

content/browser/renderer_host/websocket_host.cc

 // Copyright 2013 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/browser/renderer_host/websocket_host.h"
 
 #include <inttypes.h>
 
 #include <utility>
 
@@ skipping 482 matching lines @@
       partition->GetFileSystemContext();
 
   net::WebSocketEventInterface::ChannelState channel_state =
       net::WebSocketEventInterface::CHANNEL_ALIVE;
 
   // This use of base::Unretained is safe because the WebSocketBlobSender object
   // is owned by this object and will not call it back after destruction.
   int rv = blob_sender_->Start(
       uuid, expected_size, dispatcher_->blob_storage_context(),
       file_system_context,
-      BrowserThread::GetMessageLoopProxyForThread(BrowserThread::FILE).get(),
+      BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE).get(),
       &channel_state,
       base::Bind(&WebSocketHost::BlobSendComplete, base::Unretained(this)));
   if (channel_state == net::WebSocketEventInterface::CHANNEL_ALIVE &&
       rv != net::ERR_IO_PENDING)
     BlobSendComplete(rv);
   // |this| may be destroyed here.
 }
 
 void WebSocketHost::OnSendFrame(bool fin,
                                 WebSocketMessageType type,
@@ skipping 79 matching lines @@
     default:
       ignore_result(dispatcher_->NotifyFailure(
           routing_id_,
           "Failed to load Blob: error code = " + net::ErrorToString(result)));
       // |this| is destroyed here.
       return;
   }
 }
 
 }  // namespace content