Remove calls to MessageLoop::current() in mojo.

mojo/message_pump/handle_watcher.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 "mojo/message_pump/handle_watcher.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
@@ skipping 259 matching lines @@
   }
 
   // We outlive |thread_|, so it's safe to use Unretained() here.
   thread_.task_runner()->PostTask(
       FROM_HERE,
       base::Bind(&WatcherThreadManager::ProcessRequestsOnBackendThread,
                  base::Unretained(this)));
 }
 
 void WatcherThreadManager::ProcessRequestsOnBackendThread() {
-  DCHECK_EQ(thread_.message_loop(), base::MessageLoop::current());
+  DCHECK(thread_.task_runner()->BelongsToCurrentThread());
 
   Requests requests;
   {
     base::AutoLock auto_lock(lock_);
     requests_.swap(requests);
   }
   for (size_t i = 0; i < requests.size(); ++i) {
     if (requests[i].type == REQUEST_START) {
       backend_.StartWatching(requests[i].start_data);
     } else {
@@ skipping 180 matching lines @@
         this, handle, handle_signals, deadline, callback));
   }
 }
 
 void HandleWatcher::Stop() {
   state_.reset();
 }
 
 }  // namespace common
 }  // namespace mojo