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

ui/base/gtk/menu_label_accelerator_util.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/gtk/menu_label_accelerator_util.h"
 
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 
 namespace {
 
 // Common implementation of ConvertAcceleratorsFromWindowsStyle() and
 // RemoveWindowsStyleAccelerators().
 // Replaces all ampersands (as used in our grd files to indicate mnemonics)
 // to |target|, except ampersands appearing in pairs which are replaced by
 // a single ampersand. Any underscores get replaced with two underscores as
 // is needed by GTK.
 std::string ConvertAmpersandsTo(const std::string& label,
@@ skipping 35 matching lines @@
 // escapes strings for later processing by ConvertAmpersandsTo(), so that
 // ConvertAmpersandsTo(EscapeWindowsStyleAccelerators(x), *) is |x| with
 // underscores doubled, making the string that appears to the user just |x|.
 std::string EscapeWindowsStyleAccelerators(const std::string& label) {
   std::string ret;
   ReplaceChars(label, "&", "&&", &ret);
   return ret;
 }
 
 }  // namespace ui