Cleanup: Remove unneeded includes of pref_names.h

chrome/browser/browser_about_handler.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 "chrome/browser/browser_about_handler.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 31 matching lines @@
 #include "chrome/browser/renderer_host/render_view_host.h"
 #include "chrome/browser/sync/profile_sync_service.h"
 #include "chrome/browser/sync/sync_ui_util.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/common/about_handler.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/gpu_info.h"
 #include "chrome/common/jstemplate_builder.h"
 #include "chrome/common/net/gaia/google_service_auth_error.h"
-#include "chrome/common/pref_names.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/url_constants.h"
 #include "googleurl/src/gurl.h"
 #include "grit/browser_resources.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "grit/locale_settings.h"
 #include "webkit/glue/webkit_glue.h"
 #include "net/base/escape.h"
 #ifdef CHROME_V8
@@ skipping 1056 matching lines @@
     // Run the dialog. This will re-use the existing one if it's already up.
     AboutIPCDialog::RunDialog();
     return true;
   }
 #endif
 
 #endif  // OFFICIAL_BUILD
 
   return false;
 }