Disable MediaRouterIntegrationBrowserTest.Dialog_Basic on MacOS

It was detected to be flaky

TBR=mfoltz@chromium.org

Bug: 824610
Change-Id: I958b7ecf83d01eb396638461271262599286fb7a
Reviewed-on: https://chromium-review.googlesource.com/975304Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Commit-Queue: Christos Froussios <cfroussios@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545046}

chrome/test/media_router/media_router_integration_ui_browsertest.cc

@@ -12,13 +12,19 @@
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if defined(OS_MACOSX)
+#define MAYBE_Dialog_Basic DISABLED_Dialog_Basic
+#else
+#define MAYBE_Dialog_Basic Dialog_Basic
+#endif
+
 namespace media_router {
 
 namespace {
 const char kTestSinkName[] = "test-sink-1";
 }
 
-IN_PROC_BROWSER_TEST_F(MediaRouterIntegrationBrowserTest, Dialog_Basic) {
+IN_PROC_BROWSER_TEST_F(MediaRouterIntegrationBrowserTest, MAYBE_Dialog_Basic) {
   OpenTestPage(FILE_PATH_LITERAL("basic_test.html"));
   content::WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();