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The UIChromeOSTestSuite will fail some of the unit tests based on
views::ViewsTestBase. In the retries, the tests will pass.

By comparing UIChromeOSTestSuite and ViewsTestSuite, the only difference
is that UIChromeOSTestSuite does not init/clear up aura env.

This cl properly sets up and cleans up the aura env for UIChromeOSTestSuite.

Bug: 807148
Test: ui_chromeos_unittests
Change-Id: Ife3bae23c2003a6e219764f7483cdff7eb785c72
Reviewed-on: https://chromium-review.googlesource.com/892495
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532944}