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

chrome/browser/external_protocol/external_protocol_handler_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 "chrome/browser/external_protocol/external_protocol_handler.h"
 
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using content::BrowserThread;
 
 class FakeExternalProtocolHandlerWorker
     : public ShellIntegration::DefaultProtocolClientWorker {
  public:
   FakeExternalProtocolHandlerWorker(
       ShellIntegration::DefaultWebClientObserver* observer,
@@ skipping 166 matching lines @@
   DoTest(ExternalProtocolHandler::UNKNOWN,
          ShellIntegration::NOT_DEFAULT,
          true, false, false);
 }
 
 TEST_F(ExternalProtocolHandlerTest, TestLaunchSchemeUnknownChromeUnknown) {
   DoTest(ExternalProtocolHandler::UNKNOWN,
          ShellIntegration::UNKNOWN_DEFAULT,
          true, false, false);
 }