GitLab

Disables several tests derived from ExtensionMessageBubbleTest due to
flakiness that is preventing unrelated CLs from getting through the
CQ.

TBR=rdevlin.cronin@chromium.org

Bug: 836332
Change-Id: Ide21a20e639f26e1d4a3d740cdb3e660b155e28b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884581Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710115}