ios: Cleanup class/struct forward declarations

ios/web/web_state/ui/crw_web_controller.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_WEB_STATE_UI_CRW_WEB_CONTROLLER_H_
 #define IOS_WEB_WEB_STATE_UI_CRW_WEB_CONTROLLER_H_
 
 #import <UIKit/UIKit.h>
 
 #import "ios/web/net/crw_request_tracker_delegate.h"
@@ skipping 26 matching lines @@
 
 @class CRWJSInjectionReceiver;
 @protocol CRWNativeContent;
 @protocol CRWNativeContentProvider;
 @protocol CRWSwipeRecognizerProvider;
 @protocol CRWWebControllerObserver;
 @class CRWWebViewContentView;
 @protocol CRWWebViewProxy;
 class GURL;
 
-namespace base {
-class Value;
-}
-
 namespace web {
-class BrowserState;
-struct Referrer;
 class WebState;
-class WebInterstitialImpl;
 class WebStateImpl;
 }
 
 // Manages a view that can be used either for rendering web content in a web
 // view, or native content in a view provided by a NativeContentProvider.
 // CRWWebController also transparently evicts and restores the internal web
 // view based on memory pressure, and manages access to interact with the
 // web view.
 // This is an abstract class which must not be instantiated directly.
 // TODO(stuartmorgan): Move all of the navigation APIs out of this class.
@@ skipping 239 matching lines @@
 
 // Acts on a single message from the JS object, parsed from JSON into a
 // DictionaryValue. Returns NO if the format for the message was invalid.
 - (BOOL)respondToMessage:(base::DictionaryValue*)crwMessage
        userIsInteracting:(BOOL)userIsInteracting
                originURL:(const GURL&)originURL;
 
 @end
 
 #endif  // IOS_WEB_WEB_STATE_UI_CRW_WEB_CONTROLLER_H_