Move enable extensions define to a build flag.

chrome/renderer/chrome_mock_render_thread.cc

 // Copyright (c) 2012 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/renderer/chrome_mock_render_thread.h"
 
 #include "base/single_thread_task_runner.h"
+#include "extensions/features/features.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 #include "extensions/common/extension_messages.h"
 #endif
 
 ChromeMockRenderThread::ChromeMockRenderThread() {
 }
 
 ChromeMockRenderThread::~ChromeMockRenderThread() {
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 ChromeMockRenderThread::GetIOTaskRunner() {
   return io_task_runner_;
 }
 
 void ChromeMockRenderThread::set_io_task_runner(
     const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) {
   io_task_runner_ = task_runner;
 }
 
 bool ChromeMockRenderThread::OnMessageReceived(const IPC::Message& msg) {
   if (content::MockRenderThread::OnMessageReceived(msg))
     return true;
 
   // Some messages we do special handling.
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(ChromeMockRenderThread, msg)
     IPC_MESSAGE_HANDLER(ExtensionHostMsg_OpenChannelToExtension,
                         OnOpenChannelToExtension)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 #else
   return false;
 #endif
 }
 
-#if defined(ENABLE_EXTENSIONS)
+#if BUILDFLAG(ENABLE_EXTENSIONS)
 void ChromeMockRenderThread::OnOpenChannelToExtension(
     int routing_id,
     const ExtensionMsg_ExternalConnectionInfo& info,
     const std::string& channel_name,
     bool include_tls_channel_id,
     int request_id) {
   Send(new ExtensionMsg_AssignPortId(routing_id, 0, request_id));
 }
 #endif