[Sheriff] Disable flaky InputToOOPIFAfterActivation on Mac

TBR=adithyas

Bug: 1042703
Change-Id: I5c8634b2b709940fd9b7348bd287e87337587ab3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006553Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732798}

content/browser/portal/portal_browsertest.cc

@@ -490,7 +490,14 @@ IN_PROC_BROWSER_TEST_F(PortalHitTestBrowserTest, NoInputToOOPIFInPortal) {
 
 // Tests that an OOPIF inside a portal receives input events after the portal is
 // activated.
-IN_PROC_BROWSER_TEST_F(PortalHitTestBrowserTest, InputToOOPIFAfterActivation) {
+// Flaky on macOS: https://crbug.com/1042703
+#if defined(OS_MACOSX)
+#define MAYBE_InputToOOPIFAfterActivation DISABLED_InputToOOPIFAfterActivation
+#else
+#define MAYBE_InputToOOPIFAfterActivation InputToOOPIFAfterActivation
+#endif
+IN_PROC_BROWSER_TEST_F(PortalHitTestBrowserTest,
+                       MAYBE_InputToOOPIFAfterActivation) {
   EXPECT_TRUE(NavigateToURL(
       shell(), embedded_test_server()->GetURL("portal.test", "/title1.html")));
   WebContentsImpl* web_contents_impl =