Disable test PortalBrowserTest.TouchAckAfterActivateAndAdopt on MAC

TBR=boliu@chromium.org

Bug: 990717
Change-Id: I36ae63ecdf38467a48161bbf557f8ad84a5b4901
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1737088Reviewed-by: Gang Wu <gangwu@chromium.org>
Commit-Queue: Gang Wu <gangwu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684038}

content/browser/portal/portal_browsertest.cc

@@ -743,9 +743,16 @@ IN_PROC_BROWSER_TEST_F(PortalBrowserTest, TouchAckAfterActivate) {
   input_event_ack_waiter.Wait();
 }
 
+#if defined(OS_MACOSX)
+//  TODO(crbug.com/941824): Test flaky on MAC
+#define MAYBE_TouchAckAfterActivateAndAdopt \
+  DISABLED_TouchAckAfterActivateAndAdopt
+#else
+#define MAYBE_TouchAckAfterActivateAndAdopt TouchAckAfterActivateAndAdopt
+#endif
 // Regression test for crbug.com/973647. Tests that receiving a touch ack
 // after activation and predecessor adoption doesn't cause a crash.
-IN_PROC_BROWSER_TEST_F(PortalBrowserTest, TouchAckAfterActivateAndAdopt) {
+IN_PROC_BROWSER_TEST_F(PortalBrowserTest, MAYBE_TouchAckAfterActivateAndAdopt) {
   EXPECT_TRUE(NavigateToURL(
       shell(), embedded_test_server()->GetURL("portal.test", "/title1.html")));
   WebContentsImpl* web_contents_impl =