[ios] Set WebState::IsLoading flag to false if load is cancelled.

ios/web/web_state/ui/crw_web_controller.mm

 // 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.
 
 #import "ios/web/web_state/ui/crw_web_controller.h"
 
 #import <WebKit/WebKit.h>
 
 #import <objc/runtime.h>
 #include <stddef.h>
@@ skipping 2186 matching lines @@
     case web::PAGE_LOADING:
       // The previous load never fully completed before this page change. The
       // loadPhase is changed to PAGE_LOADED to indicate the cycle is complete,
       // and the delegate is called.
       _loadPhase = web::PAGE_LOADED;
       if (!_isHalted) {
         // RequestTracker expects StartPageLoad to be followed by
         // FinishPageLoad, passing the exact same URL.
         self.webStateImpl->GetRequestTracker()->FinishPageLoad(
             _URLOnStartLoading, false);
+        _webStateImpl->SetIsLoading(false);
       }
       [_delegate webLoadCancelled:_URLOnStartLoading];
       break;
     case web::PAGE_LOADED:
       break;
   }
 }
 
 - (void)prepareForGoBack {
   // Before changing the current session history entry, record the tab state.
@@ skipping 3447 matching lines @@
   }
 
   return web::WEB_VIEW_DOCUMENT_TYPE_GENERIC;
 }
 
 - (NSString*)refererFromNavigationAction:(WKNavigationAction*)action {
   return [action.request valueForHTTPHeaderField:@"Referer"];
 }
 
 @end