Use a direct include of the message_loop header in chrome/browser/, part 7.

chrome/browser/metrics/metrics_service_unittest.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 <ctype.h>
 #include <string>
 
 #include "base/command_line.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "chrome/browser/metrics/metrics_service.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/scoped_testing_local_state.h"
 #include "chrome/test/base/testing_browser_process.h"
 #include "content/public/common/process_type.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
@@ skipping 90 matching lines @@
   {
     CommandLine::ForCurrentProcess()->AppendSwitch(
         switches::kResetVariationState);
 
     MetricsService service;
     service.GetLowEntropySource();
 
     EXPECT_TRUE(GetLocalState()->GetString(kCachePrefName).empty());
   }
 }