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- upgrade_util.{cc,h} and friends are now only included in the build for
  relevant platforms (desktop Chrome).
- upgrade_util::SetNewCommandLine now explicitly takes ownership of its
  argument.
- A test seam has been added to RelaunchChromeBrowser. Tests may now
  specify a callback to be run when relaunch takes place.
- Unexpected calls to RelaunchChromeBrowser in browser_tests and friends
  now cause test failures (they previously attempted to launch Chrome).
- ScopedRelaunchChromeBrowserOverride is now available for tests of
  scenarios that involved RelaunchChromeBrowser.

BUG=958893,989468

Change-Id: I8620e2bbe56e282934b94b3ea2ae52ef32f9d04a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1736707
Auto-Submit: Greg Thompson <grt@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Greg Thompson <grt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685466}