Migrate content/ files to histogram_macros.h includes.

content/browser/renderer_host/text_input_client_mac.mm

 // 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.
 
 #import "content/browser/renderer_host/text_input_client_mac.h"
 
 #include "base/memory/singleton.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/common/text_input_client_messages.h"
 
 namespace content {
 
 // The amount of time in milliseconds that the browser process will wait for a
 // response from the renderer.
 // TODO(rsesek): Using the histogram data, find the best upper-bound for this
@@ skipping 117 matching lines @@
 
   character_index_ = NSNotFound;
   first_rect_ = NSZeroRect;
 }
 
 void TextInputClientMac::AfterRequest() {
   lock_.Release();
 }
 
 }  // namespace content