[Extensions] Short-circuit activity logging if not enabled

chrome/browser/extensions/chrome_extensions_browser_client.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/chrome_extensions_browser_client.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
@@ skipping 230 matching lines @@
 }
 
 bool ChromeExtensionsBrowserClient::IsLoggedInAsPublicAccount() {
 #if defined(OS_CHROMEOS)
   return user_manager::UserManager::Get()->IsLoggedInAsPublicAccount();
 #else
   return false;
 #endif
 }
 
-ApiActivityMonitor* ChromeExtensionsBrowserClient::GetApiActivityMonitor(
-    content::BrowserContext* context) {
-  // The ActivityLog monitors and records function calls and events.
-  return ActivityLog::GetInstance(context);
-}
-
 ExtensionSystemProvider*
 ChromeExtensionsBrowserClient::GetExtensionSystemFactory() {
   return ExtensionSystemFactory::GetInstance();
 }
 
 void ChromeExtensionsBrowserClient::RegisterExtensionFunctions(
     ExtensionFunctionRegistry* registry) const {
   // Preferences.
   registry->RegisterFunction<GetPreferenceFunction>();
   registry->RegisterFunction<SetPreferenceFunction>();
@@ skipping 144 matching lines @@
 
 std::unique_ptr<content::BluetoothChooser>
 ChromeExtensionsBrowserClient::CreateBluetoothChooser(
     content::RenderFrameHost* frame,
     const content::BluetoothChooser::EventHandler& event_handler) {
   return base::WrapUnique(
       new ChromeExtensionBluetoothChooser(frame, event_handler));
 }
 
 }  // namespace extensions