Autofill: disable testTapInputFieldShowsKeyboardAccessory

Flaky.

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=chrome_public_test_apk&tests=testTapInputFieldShowsKeyboardAccessory

Bug: 838922
TBR: fhorschig@chromium.org,bauerb@chromium.org
Change-Id: I9b55187a8d528a149221075f03186bbaa2b8e789
Reviewed-on: https://chromium-review.googlesource.com/1039826Reviewed-by: Matthew Cary <mattcary@chromium.org>
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555402}

chrome/android/javatests/src/org/chromium/chrome/browser/autofill/AutofillKeyboardAccessoryIntegrationTest.java

@@ -127,6 +127,7 @@ public class AutofillKeyboardAccessoryIntegrationTest {
     @Test
     @MediumTest
     @Feature({"keyboard-accessory"})
+    @DisabledTest(message = "crbug.com/838922")
     public void testTapInputFieldShowsKeyboardAccessory()
             throws ExecutionException, InterruptedException, TimeoutException {
         loadTestPage(false);