[Extensions] Short-circuit activity logging if not enabled

extensions/browser/api/web_request/web_request_event_router_delegate.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_API_WEB_REQUEST_WEB_REQUEST_EVENT_ROUTER_DELEGATE_H_
 #define EXTENSIONS_BROWSER_API_WEB_REQUEST_WEB_REQUEST_EVENT_ROUTER_DELEGATE_H_
 
-#include <memory>
 #include <string>
 
-#include "base/macros.h"
-
-class GURL;
-
-namespace base {
-class DictionaryValue;
-}  // namespace base
-
-namespace content {
-class BrowserContext;
-}  // namespace content
-
-namespace net {
-class URLRequest;
-}  // namespace net
-
 namespace extensions {
 
-class WebRequestEventDetails;
-
 // A delegate class of WebRequestApi that are not a part of chrome.
 class WebRequestEventRouterDelegate {
  public:
-  WebRequestEventRouterDelegate();
-  virtual ~WebRequestEventRouterDelegate();
-
-  // Logs an extension action.
-  virtual void LogExtensionActivity(
-      content::BrowserContext* browser_context,
-      bool is_incognito,
-      const std::string& extension_id,
-      const GURL& url,
-      const std::string& api_call,
-      std::unique_ptr<base::DictionaryValue> details) {}
+  virtual ~WebRequestEventRouterDelegate() {}
 
   // Notifies that a webRequest event that normally would be forwarded to a
   // listener was instead blocked because of withheld permissions.
   virtual void NotifyWebRequestWithheld(int render_process_id,
                                         int render_frame_id,
-                                        const std::string& extension_id) {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(WebRequestEventRouterDelegate);
+                                        const std::string& extension_id) = 0;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_WEB_REQUEST_WEB_REQUEST_EVENT_ROUTER_DELEGATE_H_