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Test still failed on Win7 with TIMED_OUT. After some checking, I found
PostRunTestOnMainThread should get skipped. There are several RunLoop in
https://cs.chromium.org/chromium/src/chrome/test/base/in_process_browser_test.cc?g=0&l=550
We did not proper setup the browser so shutting down the browser would
potentially have some unknown issues.

TEST: Tested on Win7: https://chromium-swarm.appspot.com/task?id=48bce24f0c843610
Bug: 1025335
Change-Id: I323cf6aaad599fb0661949281dd97e0f58117b63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1933383Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Commit-Queue: Sven Zheng <svenzheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719243}