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Updates the ThreadProfiler configuration to consider a build to be a
Chrome release if it's official and Chrome branded. The existing code
only considered the Chrome branded state which is overly lenient. For
what its worth breakpad uses the same conditions for whether it should
be enabled.

This changes behavior of edge cases as follows:

Unofficial Chrome branded builds are now considered to be
development/CQ builds and as such the profiler is always enabled
for them.

Official Chrome branded builds with unknown channel are no longer
treated as development/CQ builds, so the profiler is disabled for
them rather than always enabled.

Bug: 1129939
Change-Id: I52b2120ef98734278ffd211809463c2ded3d3bd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432386
Commit-Queue: Mike Wittman <wittman@chromium.org>
Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812417}