Remove wstring from RVH's run Javascript command....

chrome/browser/automation/testing_automation_provider_win.cc

 // Copyright (c) 2010 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/automation/testing_automation_provider.h"
 
 #include <windows.h>
 
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ skipping 64 matching lines @@
     HWND hwnd = window_tracker_->GetResource(handle);
     ::ShowWindow(hwnd, visible ? SW_SHOW : SW_HIDE);
     *result = true;
   } else {
     *result = false;
   }
 }
 
 void TestingAutomationProvider::GetWindowTitle(int handle, string16* text) {
   gfx::NativeWindow window = window_tracker_->GetResource(handle);
-  std::wstring result;
+  string16 result;
   int length = ::GetWindowTextLength(window) + 1;
   ::GetWindowText(window, WriteInto(&result, length), length);
   text->assign(WideToUTF16(result));
 }