[ios] Fix 'newtab?' layout.

Bug: 860129
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I6dec83e03cc51b5ce8239aebd8a5e22639a1996d
Reviewed-on: https://chromium-review.googlesource.com/1139633Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575660}

ios/chrome/browser/ui/browser_view_controller.mm

@@ -3986,7 +3986,7 @@ applicationCommandEndpoint:(id<ApplicationCommands>)applicationCommandEndpoint {
 - (CGFloat)nativeContentHeaderHeightForWebState:(web::WebState*)webState {
   Tab* tab = LegacyTabHelper::GetTabForWebState(webState);
   if (IsUIRefreshPhase1Enabled() && tab &&
-      tab.webState->GetVisibleURL() == kChromeUINewTabURL &&
+      tab.webState->GetVisibleURL().GetOrigin() == kChromeUINewTabURL &&
       ![self canShowTabStrip]) {
     if (self.usesFullscreenContainer)
       return 0;