Disable flaky testAutoDismissPromo()

TBR=bsazonov@chromium.org,bauerb@chromium.org,iuliah@google.com

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 789531
Change-Id: I9ffa24762c4bd4f3b4d700acc827af8e5aca6eaf
Reviewed-on: https://chromium-review.googlesource.com/796610Reviewed-by: Henrik Boström <hbos@chromium.org>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520098}

chrome/android/javatests/src/org/chromium/chrome/browser/bookmarks/BookmarkPersonalizedSigninPromoTest.java

@@ -84,6 +84,7 @@ public class BookmarkPersonalizedSigninPromoTest {
     @Test
     @LargeTest
     @DisableIf.Device(type = {UiDisableIf.TABLET}) // https://crbug.com/776405.
+    @DisabledTest(message = "Flaky. See crbug.com/789531")
     public void testAutoDismissPromo() throws Exception {
         int impressionCap = SigninPromoController.getMaxImpressionsBookmarksForTests();
         for (int impression = 0; impression < impressionCap; impression++) {