Use a direct include of strings headers in ui/, part 3.

ui/views/controls/textfield/native_textfield_win.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/views/controls/textfield/native_textfield_win.h"
 
 #include <algorithm>
 
 #include "base/i18n/case_conversion.h"
 #include "base/i18n/rtl.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/metro.h"
 #include "base/win/windows_version.h"
 #include "grit/ui_strings.h"
 #include "skia/ext/skia_utils_win.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/clipboard/scoped_clipboard_writer.h"
 #include "ui/base/events/event.h"
 #include "ui/base/ime/win/tsf_bridge.h"
@@ skipping 1289 matching lines @@
     return true;
   MSG msg(*GetCurrentMessage());
   // ATL doesn't set the |time| field.
   if (!msg.time)
     msg.time = GetMessageTime();
   ui::MouseEvent mouse_event(msg);
   return !controller->HandleMouseEvent(textfield_, mouse_event);
 }
 
 }  // namespace views