Notification: Disable flaky test NotificationIntentInterceptorTest.

NotificationIntentInterceptorTest is based on UI automator to click on
Android UI outside Chrome UI, it relies on Android UI implementation,
that we probably can delete this test.

TBR=dtrainor@chromium.org, qinmin@chromium.org

Bug: 906843
Change-Id: I83f81f960ddbe8e9f6cb8d2a70820c811182a313
Reviewed-on: https://chromium-review.googlesource.com/c/1343375Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609527}

chrome/android/javatests/src/org/chromium/chrome/browser/notifications/NotificationIntentInterceptorTest.java

@@ -25,6 +25,7 @@ import org.junit.runner.RunWith;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.base.test.util.CommandLineFlags;
+import org.chromium.base.test.util.DisabledTest;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.browser.ChromeTabbedActivity;
@@ -98,6 +99,7 @@ public class NotificationIntentInterceptorTest {
      */
     @Test
     @MediumTest
+    @DisabledTest(message = "Flaky on Kitkat, crbug.com/906843")
     public void testContentIntentInterception() {
         // Send notification.
         NotificationManager notificationManager =