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chromeos_channel value for ARC container is also extracted in the
same way. (GetChromeOsChannelFromFile() in arc_setup_util.cc)

This fixes the issue that "unknown" value is set for testimage
(b/151289109)

BUG=b:151289109
TEST="android-sh -c getprop" and check ro.boot.chromeos_channel is "testimage"

Change-Id: I7d84dab2adb665f56689cb26c2cd20082d64272c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2108306
Commit-Queue: Satoshi Niwa <niwa@chromium.org>
Auto-Submit: Satoshi Niwa <niwa@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751598}