Use a direct include of strings headers in ui/, part 2.

ui/base/win/window_impl.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 "ui/base/win/window_impl.h"
 
 #include <list>
 
 #include "base/debug/alias.h"
 #include "base/memory/singleton.h"
-#include "base/string_number_conversions.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/win/wrapped_window_proc.h"
 #include "ui/base/win/hwnd_util.h"
 
 namespace ui {
 
 static const DWORD kWindowDefaultChildStyle =
     WS_CHILD | WS_VISIBLE | WS_CLIPCHILDREN | WS_CLIPSIBLINGS;
 static const DWORD kWindowDefaultStyle = WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN;
 static const DWORD kWindowDefaultExStyle = 0;
 
@@ skipping 238 matching lines @@
   return window->OnWndProc(message, w_param, l_param);
 }
 
 ATOM WindowImpl::GetWindowClassAtom() {
   HICON icon = GetDefaultWindowIcon();
   ClassInfo class_info(initial_class_style(), icon);
   return ClassRegistrar::GetInstance()->RetrieveClassAtom(class_info);
 }
 
 }  // namespace ui