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This change fixes ArcVmClientAdapterTest.ChromeOsChannel{Stable,Unknown}
by adding a call to base::SysInfo::ResetChromeOSVersionInfoForTest().
This fixes a crash in base::SysInfo::SetChromeOSVersionInfoForTest that
happens when it is called twice without being reset.

BUG=b:174186047
TEST=ArcVmClientAdapterTest unittests

Change-Id: I5ba40f3efe5ddd44fbcf9ec7ec56711678c50248
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2559533
Auto-Submit: Willie Koomson <wvk@google.com>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831216}