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

ui/web_dialogs/web_dialog_delegate.h

 // 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.
 
 #ifndef UI_WEB_DIALOGS_WEB_DIALOG_DELEGATE_H_
 #define UI_WEB_DIALOGS_WEB_DIALOG_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/base/window_open_disposition.h"
 #include "ui/web_dialogs/web_dialogs_export.h"
 
 class GURL;
 
 namespace content {
 class RenderViewHost;
 class WebContents;
 class WebUI;
@@ skipping 98 matching lines @@
 
   // Stores the dialog bounds.
   virtual void StoreDialogSize(const gfx::Size& dialog_size) {}
 
   virtual ~WebDialogDelegate() {}
 };
 
 }  // namespace ui
 
 #endif  // UI_WEB_DIALOGS_WEB_DIALOG_DELEGATE_H_