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Rather than use one universal baseline.xml for lint, allow each target
that wants to use lint baselines to specify its own via the gn variable
lint_baseline. This also allows better co-location of baseline.xml and
the code that it refers to.

Also fixes the existing lint issues for cast apk.

Bug: 1108791
Change-Id: I982cd35636ce9e08817be6cf8b6cccd18455d8ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2327834
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796418}