Disable flaky UrlBarTest#testRefocusing

Bug: 910869
Change-Id: I34cde842fdf16d85d563b20645039ffa0a53129a
TBR: tedchoc@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1358440Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613108}

chrome/android/javatests/src/org/chromium/chrome/browser/omnibox/UrlBarTest.java

@@ -31,6 +31,7 @@ import org.junit.runner.RunWith;
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.test.util.CallbackHelper;
 import org.chromium.base.test.util.CommandLineFlags;
+import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.Feature;
 import org.chromium.base.test.util.Restriction;
 import org.chromium.base.test.util.RetryOnFailure;
@@ -221,6 +222,7 @@ public class UrlBarTest {
     @SmallTest
     @Feature({"Omnibox"})
     @RetryOnFailure
+    @DisabledTest
     public void testRefocusing() throws InterruptedException {
         mActivityTestRule.startMainActivityOnBlankPage();
         UrlBar urlBar = getUrlBar();