Use a direct include of strings headers in ui/, part 1.

ui/base/accelerators/accelerator.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/accelerators/accelerator.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(TOOLKIT_GTK)
 #include <gdk/gdk.h>
 #endif
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "grit/ui_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 
 #if !defined(OS_WIN) && (defined(USE_AURA) || defined(OS_MACOSX))
 #include "ui/base/keycodes/keyboard_code_conversion.h"
 #endif
 
 namespace ui {
 
@@ skipping 226 matching lines @@
 
     // Subtracting the size of the shortcut key and 1 for the '+' sign.
     shortcut_rtl.append(shortcut, 0, shortcut.length() - key_length - 1);
     shortcut.swap(shortcut_rtl);
   }
 
   return shortcut;
 }
 
 }  // namespace ui