Create NavigationContext right after the navigation was started.

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 235 matching lines @@
 
 // Removes an attached CRWWebControllerObserver.
 - (void)removeObserver:(id<CRWWebControllerObserver>)observer;
 
 // Returns the always-visible frame, not including the part that could be
 // covered by the toolbar.
 - (CGRect)visibleFrame;
 
 - (CRWJSInjectionReceiver*)jsInjectionReceiver;
 
-// Load the correct HTML page for |error| in a native controller, retrieved
-// from the native provider. Call |loadNativeViewWithSuccess:NO| to load the
-// native controller.
-- (void)loadErrorInNativeView:(NSError*)error;
-
 // Returns the native controller (if any) current mananging the content.
 - (id<CRWNativeContent>)nativeController;
 @end
 
 #pragma mark Testing
 
 @interface CRWWebController (UsedOnlyForTesting)  // Testing or internal API.
 
 // Returns whether the user is interacting with the page.
 @property(nonatomic, readonly) BOOL userIsInteracting;
 
 // Injects a CRWWebViewContentView for testing.  Takes ownership of
 // |webViewContentView|.
 - (void)injectWebViewContentView:(CRWWebViewContentView*)webViewContentView;
 - (void)resetInjectedWebViewContentView;
 
 // Returns the number of observers registered for this CRWWebController.
 - (NSUInteger)observerCount;
 
 // Loads the HTML into the page at the given URL.
 - (void)loadHTML:(NSString*)HTML forURL:(const GURL&)URL;
 
 @end
 
 #endif  // IOS_WEB_WEB_STATE_UI_CRW_WEB_CONTROLLER_H_