[Android] Disable failing synthetic_gestures/smooth-scroll-tiny-delta.html

This test was added by https://crrev.com/c/1293171 and it is failing on
KitKat Phone Tester (dbg) builder:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/KitKat%20Phone%20Tester%20%28dbg%29/10119

TBR=bokan@chromium.org

Bug: 898987
Change-Id: I82fe04a5d11cbe09a2794fc6daadb33ce5b1463e
Reviewed-on: https://chromium-review.googlesource.com/c/1305316Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Commit-Queue: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603580}

third_party/WebKit/LayoutTests/TestExpectations

@@ -5736,3 +5736,4 @@ crbug.com/899232 [ Linux ] virtual/user-activation-v2/fast/events/touch/gesture/
 # Sheriff 2018-10-29
 crbug.com/899710 [ Linux ] virtual/threaded/http/tests/devtools/tracing/timeline-paint/timeline-paint-with-layout-invalidations.js [ Failure Pass ]
 crbug.com/899715 [ Linux ] virtual/threaded/fast/scroll-behavior/wheel-and-touch-scroll-use-count.html [ Failure Pass ]
+crbug.com/898987 [ Android ] synthetic_gestures/smooth-scroll-tiny-delta.html [ Failure Pass ]