Revert "content: Remove use of MessageLoopProxy and deprecated MessageLoop APIs"

content/browser/histogram_synchronizer.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/browser/histogram_synchronizer.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
-#include "base/location.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_delta_serialization.h"
 #include "base/pickle.h"
-#include "base/single_thread_task_runner.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
 #include "content/browser/histogram_controller.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/histogram_fetcher.h"
 #include "content/public/common/content_constants.h"
 
 using base::Time;
 using base::TimeDelta;
 using base::TimeTicks;
@@ skipping 289 matching lines @@
     callback_.Reset();
     callback_thread_ = NULL;
   }
   InternalPostTask(thread, callback);
 }
 
 void HistogramSynchronizer::InternalPostTask(base::MessageLoop* thread,
                                              const base::Closure& callback) {
   if (callback.is_null() || !thread)
     return;
-  thread->task_runner()->PostTask(FROM_HERE, callback);
+  thread->PostTask(FROM_HERE, callback);
 }
 
 int HistogramSynchronizer::GetNextAvailableSequenceNumber(
     ProcessHistogramRequester requester) {
   base::AutoLock auto_lock(lock_);
   ++last_used_sequence_number_;
   // Watch out for wrapping to a negative number.
   if (last_used_sequence_number_ < 0) {
     // Bypass the reserved number, which is used when a renderer spontaneously
     // decides to send some histogram data.
     last_used_sequence_number_ =
         kHistogramSynchronizerReservedSequenceNumber + 1;
   }
   DCHECK_NE(last_used_sequence_number_,
             kHistogramSynchronizerReservedSequenceNumber);
   if (requester == ASYNC_HISTOGRAMS)
     async_sequence_number_ = last_used_sequence_number_;
   return last_used_sequence_number_;
 }
 
 }  // namespace content