Removed CRWWebDelagate callbacks for load cancellation.

ios/chrome/browser/tabs/tab.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/chrome/browser/tabs/tab.h"
 
 #import <CoreLocation/CoreLocation.h>
 #import <UIKit/UIKit.h>
 
 #include <utility>
@@ skipping 1648 matching lines @@
     didStartProvisionalNavigationForURL:(const GURL&)URL {
   [self.dialogDelegate cancelDialogForTab:self];
   [parentTabModel_ notifyTabChanged:self];
   [openInController_ disable];
   [[NSNotificationCenter defaultCenter]
       postNotificationName:
           kTabClosingCurrentDocumentNotificationForCrashReporting
                     object:self];
 }
 
-- (void)webCancelStartLoadingRequest {

[Eugene But (OOO till 7-30), 2017/03/10 23:43:00]

webStateDidStopLoading: is also called when provisional navigation is cancelled,
so this method can be removed.

-  DCHECK(self.webController.loadPhase == web::PAGE_LOADED);
-  [parentTabModel_ notifyTabChanged:self];
-}
-
 - (void)webState:(web::WebState*)webState
     didCommitNavigationWithDetails:(const web::LoadCommittedDetails&)details {
   DCHECK([self navigationManager]);
   // |webWillAddPendingURL:transition:| is not called for native page loads.
   // TODO(crbug.com/381201): Move this call there once that bug is fixed so that
   // |disableFullScreen| is called only from one place.
   [fullScreenController_ disableFullScreen];
   GURL lastCommittedURL = webState->GetLastCommittedURL();
   [autoReloadBridge_ loadStartedForURL:lastCommittedURL];
 
@@ skipping 110 matching lines @@
 
 - (void)webStateDidChangeTitle:(web::WebState*)webState {
   [self saveTitleToHistoryDB];
   [parentTabModel_ notifyTabChanged:self];
 }
 
 - (void)webStateDidDismissInterstitial:(web::WebState*)webState {
   [parentTabModel_ notifyTabChanged:self];
 }
 
-- (void)webLoadCancelled:(const GURL&)url {
-  // When a load is cancelled, this is the maximum that a page will ever load.
+- (void)webStateDidStopLoading:(web::WebState*)webState {
+  // This is the maximum that a page will ever load and it is safe to allow
+  // fullscreen mode.
   [fullScreenController_ enableFullScreen];
   [parentTabModel_ notifyTabChanged:self];
 }
 
 - (BOOL)webController:(CRWWebController*)webController
     shouldOpenExternalURL:(const GURL&)URL {
   if (isPrerenderTab_ && !isLinkLoadingPrerenderTab_) {
     [delegate_ discardPrerender];
     return NO;
   }
@@ skipping 368 matching lines @@
 
 - (TabModel*)parentTabModel {
   return parentTabModel_;
 }
 
 - (FormInputAccessoryViewController*)inputAccessoryViewController {
   return inputAccessoryViewController_.get();
 }
 
 @end