Cleanup: Remove unneeded chrome/common/pref_names.h includes.

chrome/browser/extensions/policy_handlers.cc

 // Copyright 2013 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/extensions/policy_handlers.h"
 
 #include "base/logging.h"
 #include "base/prefs/pref_value_map.h"
 #include "chrome/browser/extensions/extension_management_constants.h"
 #include "chrome/browser/extensions/external_policy_loader.h"
-#include "chrome/common/pref_names.h"
 #include "components/crx_file/id_util.h"
 #include "components/policy/core/browser/policy_error_map.h"
 #include "components/policy/core/common/policy_map.h"
 #include "components/policy/core/common/schema.h"
 #include "extensions/browser/pref_names.h"
 #include "extensions/common/extension.h"
 #include "grit/components_strings.h"
 #include "policy/policy_constants.h"
 #include "url/gurl.h"
 
@@ skipping 296 matching lines @@
 void ExtensionSettingsPolicyHandler::ApplyPolicySettings(
     const policy::PolicyMap& policies,
     PrefValueMap* prefs) {
   scoped_ptr<base::Value> policy_value;
   if (!CheckAndGetValue(policies, NULL, &policy_value) || !policy_value)
     return;
   prefs->SetValue(pref_names::kExtensionManagement, policy_value.release());
 }
 
 }  // namespace extensions