[ios] Removed unused CRWWebControllerObserver methods.

ios/web/public/web_state/crw_web_controller_observer.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_PUBLIC_WEB_STATE_CRW_WEB_CONTROLLER_OBSERVER_H_
 #define IOS_WEB_PUBLIC_WEB_STATE_CRW_WEB_CONTROLLER_OBSERVER_H_
 
 #import <Foundation/Foundation.h>
-#include <string>
 
 @class CRWWebController;
 @protocol CRWWebViewProxy;
-class GURL;
-@class UIWebView;
-
-namespace base {
-class DictionaryValue;
-}
 
 // NOTE: When adding new methods to CRWWebControllerObserver, consider adding
 // them to WebStateObserver instead if they need to be surfaced to the public
 // API.
 @protocol CRWWebControllerObserver<NSObject>
 
 @optional
 
-// Supplies a text prefix to the CRWWebController to indicate which commands the
-// observer should receive using the handleCommand message.
-// Called only as the observer is added to its parent CRWWebController.
-@property(nonatomic, readonly) NSString* commandPrefix;
-
 // Called when the current page is loaded.
 // DEPRECATED: Use WebStateObserver instead.
 - (void)pageLoaded:(CRWWebController*)webController;
 
 // Called when the web controller is about to close.
 - (void)webControllerWillClose:(CRWWebController*)webController;
 
-// Handle the command from page scripts. Return NO if the command was known to
-// be invalid. This will cause the page to be reset as a security precaution.
-// DEPRECATED: Use WebState::ScriptCommandCallback instead.
-- (BOOL)handleCommand:(const base::DictionaryValue&)command
-        webController:(CRWWebController*)webController
-    userIsInteracting:(BOOL)userIsInteracting
-            originURL:(const GURL&)originURL;
-
 // Gives CRWWebControllerObservers access to the CRWWebViewProxy.
 - (void)setWebViewProxy:(id<CRWWebViewProxy>)webView
              controller:(CRWWebController*)webController;
 
 @end
 
 #endif  // IOS_WEB_PUBLIC_WEB_STATE_CRW_WEB_CONTROLLER_OBSERVER_H_