[Media Router] Return NotFoundError on dialog exit if appropriate

chrome/test/media_router/media_router_integration_browsertest.cc

Index: chrome/test/media_router/media_router_integration_browsertest.cc
diff --git a/chrome/test/media_router/media_router_integration_browsertest.cc b/chrome/test/media_router/media_router_integration_browsertest.cc
index 8e984d62f0c3a075ca5907f951cfdee70e764679..9d3fdfc7cd6bfd2d5c4e4e841c15bbbc4e6129cc 100644
--- a/chrome/test/media_router/media_router_integration_browsertest.cc
+++ b/chrome/test/media_router/media_router_integration_browsertest.cc
@@ -568,4 +568,22 @@ IN_PROC_BROWSER_TEST_F(MediaRouterIntegrationBrowserTest,
   CheckStartFailed(web_contents, "AbortError", "Dialog closed.");
 }
 
+IN_PROC_BROWSER_TEST_F(MediaRouterIntegrationBrowserTest,
+                       MANUAL_Fail_StartCancelledNoSupportedSinks) {
+  SetTestData(FILE_PATH_LITERAL("no_supported_sinks.json"));
+  OpenTestPage(FILE_PATH_LITERAL("basic_test.html"));
+  content::WebContents* web_contents =
+      browser()->tab_strip_model()->GetActiveWebContents();
+  ASSERT_TRUE(web_contents);
+  content::TestNavigationObserver test_navigation_observer(web_contents, 1);
+  StartSession(web_contents);
+
+  MediaRouterDialogControllerImpl* controller =
+      MediaRouterDialogControllerImpl::GetOrCreateForWebContents(web_contents);
+  EXPECT_TRUE(controller->IsShowingMediaRouterDialog());
+  WaitUntilSinkDiscoveredOnUI();
+  controller->HideMediaRouterDialog();
+  CheckStartFailed(web_contents, "NotFoundError", "No screens found.");
+}
+
 }  // namespace media_router