Fix browser launch on the login screen.

ui/views/controls/webview/web_dialog_view.h

Index: ui/views/controls/webview/web_dialog_view.h
diff --git a/ui/views/controls/webview/web_dialog_view.h b/ui/views/controls/webview/web_dialog_view.h
index 3640184d5dfcfc65c461796eb5c50cf375e43f65..ce69cfc7968e8273090d43c5a70024b544cdd836 100644
--- a/ui/views/controls/webview/web_dialog_view.h
+++ b/ui/views/controls/webview/web_dialog_view.h
@@ -111,6 +111,15 @@ class WEBVIEW_EXPORT WebDialogView : public views::ClientView,
   void BeforeUnloadFired(content::WebContents* tab,
                          bool proceed,
                          bool* proceed_to_fire_unload) override;
+  bool ShouldCreateWebContents(
+      content::WebContents* web_contents,
+      int route_id,
+      int main_frame_route_id,
+      WindowContainerType window_container_type,
+      const base::string16& frame_name,
+      const GURL& target_url,
+      const std::string& partition_id,
+      content::SessionStorageNamespace* session_storage_namespace) override;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(WebDialogBrowserTest, WebContentRendered);