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After the Shutdown() method is called on a BCKS, the profile must not be
used anymore. This CL cleans up current usages of the |profile_| during
shutdown and adds DCHECKs where we're sure it it still valid.

Bug: 1125056
Change-Id: I847bf7e6a96abefcc370bb5761f438ed3369c4a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2400459Reviewed-by: James Vecore <vecore@google.com>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805658}