[sheriff] Disable flaky NavigationBrowserTest on Android

This CL disables NavigationBrowserTest.Bug1210234 which is failing
on Android bots.

Bug: 1222320
Change-Id: Ic3c2e748cb4e83bde54c7329e02da6ce41bc13b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2988752


Owners-Override: Alex Ilin <alexilin@google.com>
Auto-Submit: Alex Ilin <alexilin@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#896044}