Revert of base: Remove use of MessageLoopProxy

base/prefs/pref_service.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 "base/prefs/pref_service.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
-#include "base/location.h"
 #include "base/logging.h"
+#include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/default_pref_store.h"
 #include "base/prefs/pref_notifier_impl.h"
 #include "base/prefs/pref_registry.h"
 #include "base/prefs/pref_value_store.h"
-#include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
-#include "base/thread_task_runner_handle.h"
 #include "base/value_conversions.h"
 #include "build/build_config.h"
 
 namespace {
 
 class ReadErrorHandler : public PersistentPrefStore::ReadErrorDelegate {
  public:
   ReadErrorHandler(base::Callback<void(PersistentPrefStore::PrefReadError)> cb)
       : callback_(cb) {}
 
@@ skipping 41 matching lines @@
   pref_notifier_.reset();
 }
 
 void PrefService::InitFromStorage(bool async) {
   if (user_pref_store_->IsInitializationComplete()) {
     read_error_callback_.Run(user_pref_store_->GetReadError());
   } else if (!async) {
     read_error_callback_.Run(user_pref_store_->ReadPrefs());
   } else {
     // Guarantee that initialization happens after this function returned.
-    base::ThreadTaskRunnerHandle::Get()->PostTask(
+    base::MessageLoop::current()->PostTask(
         FROM_HERE,
-        base::Bind(&PersistentPrefStore::ReadPrefsAsync, user_pref_store_.get(),
+        base::Bind(&PersistentPrefStore::ReadPrefsAsync,
+                   user_pref_store_.get(),
                    new ReadErrorHandler(read_error_callback_)));
   }
 }
 
 void PrefService::CommitPendingWrite() {
   DCHECK(CalledOnValidThread());
   user_pref_store_->CommitPendingWrite();
 }
 
 bool PrefService::GetBoolean(const std::string& path) const {
@@ skipping 488 matching lines @@
       DCHECK(found_value->IsType(default_type));
       return found_value;
     } else {
       // Every registered preference has at least a default value.
       NOTREACHED() << "no valid value found for registered pref " << path;
     }
   }
 
   return NULL;
 }