GitLab

The browser test AppListClientImplBrowserTest.UninstallApp is flaky,
because AppService is mojom based, which is slow when loading icon,
compared with sync Extensions. Update the test case to flush mojo call.

BUG=1009248

Change-Id: I7e5702392ec9369991ffb357c5dcb402dd6cb0f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885134Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710615}