GitLab

Fixed typical problem with unit tests and global variables.
If unit test modifies global variables then it can affect other tests
which are runned in the same process. Added reseting of the global
variables to avoid this.

Change-Id: I2045700473ac074209f4d48a6cedbd3dad24ccd5
Reviewed-on: https://chromium-review.googlesource.com/952905
Commit-Queue: Alexander Yashkin <a-v-y@yandex-team.ru>
Reviewed-by: Carlos Pizano <cpu@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543345}