Minor cleanup in ios/web utils

ios/web/history_state_util.h

 // Copyright 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 IOS_WEB_HISTORY_STATE_UTIL_H_
 #define IOS_WEB_HISTORY_STATE_UTIL_H_
 
-#import <Foundation/Foundation.h>
-
 #include <string>
 
 class GURL;
 
 namespace web {
 namespace history_state_util {
 
 // Checks if toUrl is a valid argument to history.pushState() or
 // history.replaceState() given the current URL.
 bool IsHistoryStateChangeValid(const GURL& currentUrl,
                                const GURL& toUrl);
 
 // Generates the appropriate full URL for a history.pushState() or
 // history.replaceState() transition from currentURL to destination, resolved
 // against baseURL. |destination| may be a relative URL. Will return an invalid
 // URL if the resolved destination, or the transition, is not valid.
 GURL GetHistoryStateChangeUrl(const GURL& currentUrl,
                               const GURL& baseUrl,
                               const std::string& destination);
 
 }  // namespace history_state_util
 }  // namespace web
 
 #endif  // IOS_WEB_HISTORY_STATE_UTIL_H_