Use a direct include of the message_loop header in content/, part 1.

content/browser/host_zoom_map_impl_unittest.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 "content/browser/host_zoom_map_impl.h"
 
 #include "base/memory/ref_counted.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 
 class HostZoomMapTest : public testing::Test {
  public:
   HostZoomMapTest() : ui_thread_(BrowserThread::UI, &message_loop_) {
   }
@@ skipping 32 matching lines @@
 
   host_zoom_map.SetZoomLevelForHost("login", zoomed);
 
   EXPECT_DOUBLE_EQ(0,
       host_zoom_map.GetZoomLevelForHostAndScheme("chrome", "login"));
   EXPECT_DOUBLE_EQ(zoomed,
       host_zoom_map.GetZoomLevelForHostAndScheme("http", "login"));
 }
 
 }  // namespace content