[Media Router tests] Fix MANUAL_Fail_StartCancelledNoSupportedSinks.

chrome/test/media_router/media_router_integration_browsertest.h

Index: chrome/test/media_router/media_router_integration_browsertest.h
diff --git a/chrome/test/media_router/media_router_integration_browsertest.h b/chrome/test/media_router/media_router_integration_browsertest.h
index a7888ded7babc66fc51462d9341b2a58ed451e24..a813450d664971ec961579e66f64900a14231759 100644
--- a/chrome/test/media_router/media_router_integration_browsertest.h
+++ b/chrome/test/media_router/media_router_integration_browsertest.h
@@ -74,8 +74,10 @@ class MediaRouterIntegrationBrowserTest : public MediaRouterBaseBrowserTest {
 
   void CheckDialogRemainsOpen(content::WebContents* web_contents);
 
-  // Opens "basic_test.html," and starts a presentation.
-  content::WebContents* StartSessionWithTestPageNow();
+  // Opens "basic_test.html" and asserts that attempting to start a presentation
+  // fails with NotFoundError due to no sinks available.
+  void StartSessionAndAssertNotFoundError();
+
   // Opens "basic_test.html," waits for sinks to be available, and starts a
   // presentation.
   content::WebContents* StartSessionWithTestPageAndSink();