FBTF: Remove "obviously" unneeded standard C++ library #includes.

chrome/browser/views/modal_dialog_delegate.h

Index: chrome/browser/views/modal_dialog_delegate.h
diff --git a/chrome/browser/views/modal_dialog_delegate.h b/chrome/browser/views/modal_dialog_delegate.h
index 42d6a1ed01aa9f043420af2d46dee7d593961a8b..ad7125e7440ab6d1c01e1aedc1921a5c2a560234 100644
--- a/chrome/browser/views/modal_dialog_delegate.h
+++ b/chrome/browser/views/modal_dialog_delegate.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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.
 
@@ -6,8 +6,6 @@
 #define CHROME_BROWSER_VIEWS_MODAL_DIALOG_DELEGATE_H_
 #pragma once
 
-#include <string>
-
 #include "views/window/dialog_delegate.h"
 
 namespace views {