Call WebStateObserver::DidStopLoading for native content reloads.

ios/web/web_state/ui/crw_web_controller.mm

Index: ios/web/web_state/ui/crw_web_controller.mm
diff --git a/ios/web/web_state/ui/crw_web_controller.mm b/ios/web/web_state/ui/crw_web_controller.mm
index 051d2dad743bfe9acce36f1270674836f6e33ed3..864dda6e8d67694392fdfa5982ab100413e75260 100644
--- a/ios/web/web_state/ui/crw_web_controller.mm
+++ b/ios/web/web_state/ui/crw_web_controller.mm
@@ -2039,6 +2039,7 @@ registerLoadRequestForURL:(const GURL&)requestURL
         registerLoadRequestForURL:url
                          referrer:self.currentNavItemReferrer
                        transition:ui::PageTransition::PAGE_TRANSITION_RELOAD];
+    [self didStartLoadingURL:url];
     [self.nativeController reload];
     _webStateImpl->OnNavigationFinished(navigationContext.get());
     [self loadCompleteWithSuccess:YES forNavigation:nil];
@@ -2139,8 +2140,6 @@ registerLoadRequestForURL:(const GURL&)requestURL
   if (_loadPhase != web::PAGE_LOADING)
     return;
 
-  DCHECK(_webView);

[Eugene But (OOO till 7-30), 2017/05/26 17:36:32]

This is now called for native content

-
   const GURL currentURL([self currentURL]);
 
   _loadPhase = web::PAGE_LOADED;