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Soon, with TargetChannel, an instance of Chrome on the disk
might be upgraded to an instance of Chrome of a different
channel. Cache the channel information on startup, so that
even if it's changed, the channel information of the current
running instance is available.

Fixed: 1163159
Change-Id: Ie9ffd98325a0da335778206709f94ea5591e9af0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2618041Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841840}