Fix one more instance of scoped_ptr<T>(NULL) on Windows.

chrome_frame/test/automation_client_mock.h

 // 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.
 
 #ifndef CHROME_FRAME_TEST_AUTOMATION_CLIENT_MOCK_H_
 #define CHROME_FRAME_TEST_AUTOMATION_CLIENT_MOCK_H_
 
 #include <windows.h>
 #include <string>
 
@@ skipping 151 matching lines @@
     ASSERT_EQ(NULL, tab_.get());
     tab_ = new TabProxy(&dummy_sender_, tracker_.get(), tab_handle_);
   }
 
   // Easy methods to set expectations.
   void SetAutomationServerOk(int times);
   void Set_CFD_LaunchFailed(AutomationLaunchResult result);
 
  protected:
   CFACMockTest()
-    : tracker_(NULL), timeout_(500),
+    : timeout_(500),
       returned_proxy_(static_cast<ChromeFrameAutomationProxy*>(&mock_proxy_)) {
     GetChromeFrameProfilePath(L"Adam.N.Epilinter", &profile_path_);
     id_ = reinterpret_cast<void*>(5);
     tab_handle_ = 3;
   }
 
   virtual void SetUp() {
     dummy_sender_.ForwardTo(&mock_proxy_);
     tracker_.reset(new AutomationHandleTracker());
 
     client_ = new ChromeFrameAutomationClient;
     client_->set_proxy_factory(&factory_);
   }
 };
 
 #endif  // CHROME_FRAME_TEST_AUTOMATION_CLIENT_MOCK_H_