Remove ContentRulesRegistry dependence from RulesRegistryService.

extensions/browser/api/extensions_api_client.cc

 // Copyright 2014 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 "extensions/browser/api/extensions_api_client.h"
 
 #include "base/logging.h"
 #include "extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest_delegate.h"
 #include "extensions/browser/guest_view/web_view/web_view_permission_helper_delegate.h"
 
@@ skipping 49 matching lines @@
     const RulesRegistry::WebViewKey& webview_key,
     const std::string& event_name) {
   return scoped_refptr<RulesRegistry>();
 }
 
 WebRequestEventRouterDelegate*
 ExtensionsAPIClient::CreateWebRequestEventRouterDelegate() const {
   return NULL;
 }
 
+scoped_refptr<ContentRulesRegistry>
+ExtensionsAPIClient::GetContentRulesRegistry(
+    content::BrowserContext* browser_context,
+    RulesCacheDelegate* cache_delegate) const {
+  return scoped_refptr<ContentRulesRegistry>();
+}
+
 }  // namespace extensions