Disable PermissionsApiTest.AlwaysAllowed

It's flaky on Mac.

TBR=rdevlin.cronin@chromium.org

BUG: 1064929
Change-Id: I4e0ffd4da0c154c020882f1d04353005f1cbe5f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2121258Reviewed-by: Tim Schumann <tschumann@chromium.org>
Commit-Queue: Tim Schumann <tschumann@chromium.org>
Auto-Submit: Tim Schumann <tschumann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753595}

chrome/browser/extensions/api/permissions/permissions_apitest.cc

@@ -78,7 +78,13 @@ IN_PROC_BROWSER_TEST_F(PermissionsApiTest, FaviconPermission) {
 
 // Test functions and APIs that are always allowed (even if you ask for no
 // permissions).
-IN_PROC_BROWSER_TEST_F(PermissionsApiTest, AlwaysAllowed) {
+// Flaky on MacOS (see crbug/1064929).
+#if defined(OS_MACOSX)
+#define MAYBE_AlwaysAllowed DISABLED_AlwaysAllowed
+#else
+#define MAYBE_AlwaysAllowed AlwaysAllowed
+#endif
+IN_PROC_BROWSER_TEST_F(PermissionsApiTest, MAYBE_AlwaysAllowed) {
   ASSERT_TRUE(RunExtensionTest("permissions/always_allowed")) << message_;
 }