Disable a GC test in StartSurfaceLayoutTest on Oreo

This CL disables the testActivityCanBeGarbageCollectedAfterFinished test
on SDK version >= Android O.

TBR=meiliang@chromium.org

Bug: 1081909
Change-Id: I867a53125eef1798059d1537b18684caff33f0c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2200356Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768581}

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

@@ -4,6 +4,7 @@
 
 package org.chromium.chrome.features.start_surface;
 
+import static android.os.Build.VERSION_CODES.N_MR1;
 import static android.os.Build.VERSION_CODES.O_MR1;
 import static android.support.test.espresso.Espresso.onView;
 import static android.support.test.espresso.action.ViewActions.click;
@@ -1686,7 +1687,7 @@ public class StartSurfaceLayoutTest {
 
     @Test
     @MediumTest
-    @DisableIf.Build(sdk_is_greater_than = O_MR1, message = "crbug.com/1077191")
+    @DisableIf.Build(sdk_is_greater_than = N_MR1, message = "crbug.com/1077191, crbug.com/1081909")
     public void testActivityCanBeGarbageCollectedAfterFinished() throws Exception {
         prepareTabs(1, 0, "about:blank");