Get rid of the following dependencies from content:

content/browser/renderer_host/backing_store_manager.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/renderer_host/backing_store_manager.h"
 
 #include "base/command_line.h"
 #include "base/memory/mru_cache.h"
 #include "base/sys_info.h"
-#include "chrome/common/chrome_constants.h"
 #include "content/browser/renderer_host/backing_store.h"
 #include "content/browser/renderer_host/render_widget_host.h"
 #include "content/common/content_switches.h"
 #include "content/common/notification_service.h"
 
 namespace {
 
 // There are two separate caches, |large_cache| and |small_cache|.  large_cache
 // is meant for large items (tabs, popup windows), while small_cache is meant
 // for small items (extension toolstrips and buttons, etc.).  The idea is that
@@ skipping 254 matching lines @@
   size_t mem = 0;
   BackingStoreCache::iterator it;
   for (it = large_cache->begin(); it != large_cache->end(); ++it)
     mem += it->second->MemorySize();
 
   for (it = small_cache->begin(); it != small_cache->end(); ++it)
     mem += it->second->MemorySize();
 
   return mem;
 }