[ios] Added API to enable/disable web usage for WebState.

ios/web/shell/view_controller.mm

 // Copyright 2014 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.
 
 #import "ios/web/shell/view_controller.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
 
 #include "base/mac/objc_property_releaser.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "ios/net/cookies/cookie_store_ios.h"
 #import "ios/net/crn_http_protocol_handler.h"
 #import "ios/net/empty_nsurlcache.h"
 #include "ios/web/public/referrer.h"
 #include "ios/web/public/web_state/web_state.h"
 #import "ios/web/public/web_state/web_state_delegate_bridge.h"
 #import "ios/web/public/web_state/web_state_observer_bridge.h"
 #include "ios/web/shell/shell_browser_state.h"
-#include "ios/web/web_state/ui/crw_web_controller.h"
 #include "ios/web/web_state/web_state_impl.h"
 #include "ui/base/page_transition_types.h"
 
 NSString* const kWebShellBackButtonAccessibilityLabel = @"Back";
 NSString* const kWebShellForwardButtonAccessibilityLabel = @"Forward";
 NSString* const kWebShellAddressFieldAccessibilityLabel = @"Address field";
 
 using web::NavigationManager;
 
 @interface ViewController ()<CRWWebStateDelegate,
@@ skipping 73 matching lines @@
 
   [_toolbarView addSubview:back];
   [_toolbarView addSubview:forward];
   [_toolbarView addSubview:field];
 
   // Set up the network stack before creating the WebState.
   [self setUpNetworkStack];
 
   _webState.reset(new web::WebStateImpl(_browserState));
   _webState->GetNavigationManagerImpl().InitializeSession(nil, nil, NO, 0);
-  [_webState->GetWebController() setWebUsageEnabled:YES];
+  _webState->SetWebUsageEnabled(true);
 
   _webStateObserver.reset(
       new web::WebStateObserverBridge(_webState.get(), self));
   _webStateDelegate.reset(new web::WebStateDelegateBridge(self));
   _webState->SetDelegate(_webStateDelegate.get());
 
   UIView* view = _webState->GetView();
   [view setFrame:[_containerView bounds]];
   [_containerView addSubview:view];
 
@@ skipping 125 matching lines @@
     (const web::LoadCommittedDetails&)details {
   [self updateToolbar];
 }
 
 - (void)webStateDidLoadPage:(web::WebState*)webState {
   DCHECK_EQ(_webState.get(), webState);
   [self updateToolbar];
 }
 
 @end