Stabilize smoke_egtest by fixing testTabOpeningAndClosing.

Bug: 922813
Change-Id: I93ac2d5becdbc2a7109a67051e0cad46eb675adc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1625861
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662474}
1 file changed