Remove BrowserThread::UnsafeGetBrowserThread, add UnsafeGetMessageLoopForThread.

chrome/browser/chrome_browser_main.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.
 
 #include "chrome/browser/chrome_browser_main.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 1408 matching lines @@
   switch (thread_id) {
     case BrowserThread::FILE:
       // Now the command line has been mutated based on about:flags,
       // and the file thread has been started, we can set up metrics
       // and initialize field trials.
       metrics_ = SetupMetricsAndFieldTrials(local_state_);
 
 #if defined(USE_LINUX_BREAKPAD)
       // Needs to be called after we have chrome::DIR_USER_DATA and
       // g_browser_process.  This happens in PreCreateThreads.
-      g_browser_process->file_thread()->message_loop()->PostTask(
-          FROM_HERE, base::Bind(&GetLinuxDistroCallback));
+      BrowserThread::PostTask(BrowserThread::FILE,
+                              FROM_HERE,
+                              base::Bind(&GetLinuxDistroCallback));
 
       if (IsCrashReportingEnabled(local_state_))
         InitCrashReporter();
 #endif
       break;
 
     default:
       break;
   }
 }
@@ skipping 714 matching lines @@
   if (env->GetVar(chrome::kPreReadEnvironmentVariable, &pre_read) &&
       (pre_read == "0" || pre_read == "1")) {
     std::string uma_name(name);
     uma_name += "_PreRead";
     uma_name += pre_read == "1" ? "Enabled" : "Disabled";
     AddPreReadHistogramTime(uma_name.c_str(), time);
   }
 #endif
 #endif
 }