Pass the correct webState to the nativeContent.

ios/web/public/web_state/ui/crw_native_content_provider.h

Index: ios/web/public/web_state/ui/crw_native_content_provider.h
diff --git a/ios/web/public/web_state/ui/crw_native_content_provider.h b/ios/web/public/web_state/ui/crw_native_content_provider.h
index 6d9eacd05f245a524795f3c2ba86ad4d311d1da8..8d82fdd11540022e17c3852692c86efebdc4c3b2 100644
--- a/ios/web/public/web_state/ui/crw_native_content_provider.h
+++ b/ios/web/public/web_state/ui/crw_native_content_provider.h
@@ -10,6 +10,10 @@ class GURL;
 
 @protocol CRWNativeContent;
 
+namespace web {
+class WebState;
+}
+
 // Provide a controller to a native view representing a given URL.
 @protocol CRWNativeContentProvider
 
@@ -19,7 +23,9 @@ class GURL;
 // 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