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

ui/keyboard/keyboard_util.cc

 // Copyright (c) 2013 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/keyboard/keyboard_util.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/logging.h"
-#include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
 #include "base/values.h"
 #include "ui/base/events/event.h"
 #include "ui/base/events/event_constants.h"
 #include "ui/base/events/key_identifier_conversion.h"
 #include "ui/keyboard/keyboard_switches.h"
 
 namespace {
 
 // KeyEvent dictionary keys
 const char kType[] = "type";
@@ skipping 110 matching lines @@
       type, prototype_event.key_code(), flags, prototype_event.is_char());
   if (character) {
     event->set_character(character);
     event->set_unmodified_character(character);
   }
 
   return event;
 }
 
 }  // namespace keyboard