Disables failing WebContentsAccessibilityTest.

Tbr: dmazzoni@chromium.org
Bug: 1162479
Change-Id: I41f8dc775e99990c18555463dd814f8411b267b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2607566
Commit-Queue: Justin DeWitt <dewittj@chromium.org>
Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Reviewed-by: Mark Schillaci <mschillaci@google.com>
Cr-Commit-Position: refs/heads/master@{#839772}

content/public/android/javatests/src/org/chromium/content/browser/accessibility/WebContentsAccessibilityTest.java

@@ -37,6 +37,7 @@ import org.junit.runner.RunWith;
 import org.chromium.base.test.BaseJUnit4ClassRunner;
 import org.chromium.base.test.util.Criteria;
 import org.chromium.base.test.util.CriteriaHelper;
+import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.MinAndroidSdkLevel;
 import org.chromium.base.test.util.UrlUtils;
 import org.chromium.content_public.browser.test.util.TestThreadUtils;
@@ -542,6 +543,7 @@ public class WebContentsAccessibilityTest {
      */
     @Test
     @MediumTest
+    @DisabledTest
     @MinAndroidSdkLevel(Build.VERSION_CODES.M)
     @TargetApi(Build.VERSION_CODES.M)
     public void testMaxContentChangedEventsFired_default() throws Throwable {
@@ -574,6 +576,7 @@ public class WebContentsAccessibilityTest {
      */
     @Test
     @MediumTest
+    @DisabledTest
     @MinAndroidSdkLevel(Build.VERSION_CODES.M)
     @TargetApi(Build.VERSION_CODES.M)
     public void testMaxContentChangedEventsFired_largeLimit() throws Throwable {