Disable chrome.browser.feed.FeedRefreshTaskTest

Test is flaky, disable during investigation.

Bug: chromium:868647
Tbr: skym@chromium.org
Change-Id: I23fdc1c1041b48806437e597a495783cf59e355d
Reviewed-on: https://chromium-review.googlesource.com/1159265Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Sky Malice <skym@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579956}

chrome/android/javatests/src/org/chromium/chrome/browser/feed/FeedRefreshTaskTest.java

@@ -15,6 +15,7 @@ import org.junit.runner.RunWith;
 
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.test.util.CommandLineFlags;
+import org.chromium.base.test.util.DisabledTest;
 import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.test.ChromeJUnit4ClassRunner;
 import org.chromium.chrome.test.ChromeTabbedActivityTestRule;
@@ -76,6 +77,7 @@ public class FeedRefreshTaskTest {
 
     @Test
     @SmallTest
+    @DisabledTest(message = "crbug.com/868647")
     public void testSchedule() {
         ThreadUtils.runOnUiThreadBlocking(() -> {
             Assert.assertEquals(0, mTaskScheduler.getTaskInfoList().size());