Pass the correct webState to the nativeContent.

ios/web/public/web_state/ui/crw_native_content_provider.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_UI_CRW_NATIVE_CONTENT_PROVIDER_H_
 #define IOS_WEB_PUBLIC_WEB_STATE_UI_CRW_NATIVE_CONTENT_PROVIDER_H_
 #import <UIKit/UIKit.h>
 
 class GURL;
 
 @protocol CRWNativeContent;
 
+namespace web {
+class WebState;
+}
+
 // Provide a controller to a native view representing a given URL.
 @protocol CRWNativeContentProvider
 
 // Returns whether the Provider has a controller for the given URL.
 - (BOOL)hasControllerForURL:(const GURL&)url;
 
 // Returns an autoreleased controller for driving a native view contained
 // within the web content area. This may return nil if the url is unsupported.
 // |url| will be of the form "chrome://foo".
-- (id<CRWNativeContent>)controllerForURL:(const GURL&)url;
+// |webState| is the webState that triggered the navigation to |url|.
+- (id<CRWNativeContent>)controllerForURL:(const GURL&)url
+                            withWebState:(web::WebState*)webState;

[Eugene But (OOO till 7-30), 2017/01/27 17:31:54]

Should this be s/withWebState/webState? From interface perspective this returns
native controller "For" given web state. From implementation perspective it can
be "WithWebState", but it's not quite important here.

[Olivier, 2017/01/27 20:17:27]

|controllerForURL:webState:| it is then.
Done.

 
 // Returns an autoreleased controller for driving a native view contained
 // within the web content area. The native view will contain an error page
 // with information appropriate for the problem described in |error|.
 // |isPost| indicates whether the error was for a post request.
 - (id<CRWNativeContent>)controllerForURL:(const GURL&)url
                                withError:(NSError*)error
                                   isPost:(BOOL)isPost;
 
 @end
 
 #endif  // IOS_WEB_PUBLIC_WEB_STATE_UI_CRW_NATIVE_CONTENT_PROVIDER_H_