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For out-of-process ash code in //chrome/browser can't call into ash.
BrowserStatusMonitor was installing a global window activation observer
on ash::Shell. However, it doesn't need to do that anymore.

The code was written to change the brightness of the "running" dot we
show under the shelf icon for a v1 (non-packaged) app. However, with
the MD redesign of the shelf we always use the same dot so we don't
need to track activation state any more.

See removal of ash::STATUS_ACTIVE from enum ShelfItemStatus in
https://chromium-review.googlesource.com/c/chromium/src/+/758800

Bug: 850184, 557406
Test: browser_tests --gtest_filter=*Launcher*
Change-Id: I38ed5e563d8b52386c53fafd17174608cd4ef8d6
Reviewed-on: https://chromium-review.googlesource.com/1089914Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565119}