[Extensions] Short-circuit activity logging if not enabled

chrome/browser/extensions/chrome_extensions_browser_client.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_CHROME_EXTENSIONS_BROWSER_CLIENT_H_
 #define CHROME_BROWSER_EXTENSIONS_CHROME_EXTENSIONS_BROWSER_CLIENT_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 69 matching lines @@
       content::BrowserContext* context) override;
   void GetEarlyExtensionPrefsObservers(
       content::BrowserContext* context,
       std::vector<ExtensionPrefsObserver*>* observers) const override;
   ProcessManagerDelegate* GetProcessManagerDelegate() const override;
   std::unique_ptr<ExtensionHostDelegate> CreateExtensionHostDelegate() override;
   bool DidVersionUpdate(content::BrowserContext* context) override;
   void PermitExternalProtocolHandler() override;
   bool IsRunningInForcedAppMode() override;
   bool IsLoggedInAsPublicAccount() override;
-  ApiActivityMonitor* GetApiActivityMonitor(
-      content::BrowserContext* context) override;
   ExtensionSystemProvider* GetExtensionSystemFactory() override;
   void RegisterExtensionFunctions(
       ExtensionFunctionRegistry* registry) const override;
   void RegisterMojoServices(content::RenderFrameHost* render_frame_host,
                             const Extension* extension) const override;
   std::unique_ptr<RuntimeAPIDelegate> CreateRuntimeAPIDelegate(
       content::BrowserContext* context) const override;
   const ComponentExtensionResourceManager*
   GetComponentExtensionResourceManager() override;
   void BroadcastEventToRenderers(
@@ skipping 37 matching lines @@
   std::unique_ptr<ChromeComponentExtensionResourceManager> resource_manager_;
 
   std::unique_ptr<ExtensionCache> extension_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeExtensionsBrowserClient);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_CHROME_EXTENSIONS_BROWSER_CLIENT_H_