Migrate content/ files to histogram_macros.h includes.

content/renderer/dom_storage/dom_storage_cached_area.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 "content/renderer/dom_storage/dom_storage_cached_area.h"
 
 #include <limits>
 
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/time/time.h"
 #include "content/common/dom_storage/dom_storage_map.h"
 #include "content/renderer/dom_storage/dom_storage_proxy.h"
 
 namespace content {
 
 DOMStorageCachedArea::DOMStorageCachedArea(int64_t namespace_id,
                                            const GURL& origin,
                                            DOMStorageProxy* proxy)
     : ignore_all_mutations_(false),
@@ skipping 203 matching lines @@
     ignore_key_mutations_.erase(found);
 }
 
 void DOMStorageCachedArea::OnClearComplete(bool success) {
   DCHECK(success);
   DCHECK(ignore_all_mutations_);
   ignore_all_mutations_ = false;
 }
 
 }  // namespace content