Sheriff: Disable flaky StartSurfaceLayoutTest#testTabGroupManualSelection_DisabledForSingleTab

Bug: 1144410, 1144666
Change-Id: I340cdd5d160b926a715f69dd841fcc68dda7d74f
Tbr: wychen@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517206Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823870}

chrome/android/features/start_surface/internal/javatests/src/org/chromium/chrome/features/start_surface/StartSurfaceLayoutTest.java

@@ -1757,6 +1757,7 @@ public class StartSurfaceLayoutTest {
 
     @Test
     @MediumTest
+    @DisabledTest(message = "https://crbug.com/1144666")
     @EnableFeatures({ChromeFeatureList.TAB_GROUPS_ANDROID})
     public void testTabGroupManualSelection_DisabledForSingleTab() {
         ChromeTabbedActivity cta = mActivityTestRule.getActivity();