Remove BrowserThread::UnsafeGetBrowserThread, add UnsafeGetMessageLoopForThread.

chrome/browser/metrics/metrics_service.cc

 // Copyright (c) 2011 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.
 
 //------------------------------------------------------------------------------
 // Description of the life cycle of a instance of MetricsService.
 //
 //  OVERVIEW
 //
 // A MetricsService instance is typically created at application startup.  It
@@ skipping 782 matching lines @@
 
   log_manager_.BeginLoggingWithLog(new MetricsLog(client_id_, session_id_));
   if (state_ == INITIALIZED) {
     // We only need to schedule that run once.
     state_ = INIT_TASK_SCHEDULED;
 
     // Schedules a task on the file thread for execution of slower
     // initialization steps (such as plugin list generation) necessary
     // for sending the initial log.  This avoids blocking the main UI
     // thread.
-    g_browser_process->file_thread()->message_loop()->PostDelayedTask(FROM_HERE,
+    BrowserThread::PostDelayedTask(
+        BrowserThread::FILE,
+        FROM_HERE,
         base::Bind(&MetricsService::InitTaskGetHardwareClass,
             base::Unretained(this),
             MessageLoop::current()->message_loop_proxy()),
         kInitializationDelaySeconds * 1000);
   }
 }
 
 void MetricsService::StopRecording() {
   if (!log_manager_.current_log())
     return;
@@ skipping 738 matching lines @@
   if (local_state) {
     const PrefService::Preference* uma_pref =
         local_state->FindPreference(prefs::kMetricsReportingEnabled);
     if (uma_pref) {
       bool success = uma_pref->GetValue()->GetAsBoolean(&result);
       DCHECK(success);
     }
   }
   return result;
 }