Use a direct include of strings headers, delete some strings forwarding headers.

ui/views/examples/multiline_example.cc

 // Copyright 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/views/examples/multiline_example.h"
 
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "ui/base/events/event.h"
 #include "ui/gfx/render_text.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/controls/textfield/textfield.h"
 #include "ui/views/layout/grid_layout.h"
 #include "ui/views/view.h"
 
 namespace views {
 namespace examples {
 
@@ skipping 90 matching lines @@
   label_->SetText(new_contents);
 }
 
 bool MultilineExample::HandleKeyEvent(Textfield* sender,
                                       const ui::KeyEvent& key_event) {
   return false;
 }
 
 }  // namespace examples
 }  // namespace views