[Extensions] Short-circuit activity logging if not enabled

chrome/browser/extensions/api/chrome_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 "chrome/browser/extensions/api/chrome_extensions_api_client.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/memory/ptr_util.h"
 #include "build/build_config.h"
@@ skipping 100 matching lines @@
     WebViewGuest* web_view_guest) const {
   return new ChromeWebViewGuestDelegate(web_view_guest);
 }
 
 WebViewPermissionHelperDelegate* ChromeExtensionsAPIClient::
     CreateWebViewPermissionHelperDelegate(
         WebViewPermissionHelper* web_view_permission_helper) const {
   return new ChromeWebViewPermissionHelperDelegate(web_view_permission_helper);
 }
 
-WebRequestEventRouterDelegate*
+std::unique_ptr<WebRequestEventRouterDelegate>
 ChromeExtensionsAPIClient::CreateWebRequestEventRouterDelegate() const {
-  return new ChromeExtensionWebRequestEventRouterDelegate();
+  return base::WrapUnique(new ChromeExtensionWebRequestEventRouterDelegate());
 }
 
 scoped_refptr<ContentRulesRegistry>
 ChromeExtensionsAPIClient::CreateContentRulesRegistry(
     content::BrowserContext* browser_context,
     RulesCacheDelegate* cache_delegate) const {
   return scoped_refptr<ContentRulesRegistry>(
       new ChromeContentRulesRegistry(
           browser_context,
           cache_delegate,
@@ skipping 15 matching lines @@
   return nullptr;
 #endif
 }
 
 ManagementAPIDelegate* ChromeExtensionsAPIClient::CreateManagementAPIDelegate()
     const {
   return new ChromeManagementAPIDelegate;
 }
 
 }  // namespace extensions