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These features were originally separated with the intent to experiment
and independently compare unsandboxed vs sandboxed vs in-process
storage.

Since we're no interested in pursuing an unsandboxed service to fulfill
short-term needs, this drops the StorageServiceSandbox feature flag and
change StorageServiceOutOfProcess to imply sandboxing by default.

Bug: 1052045
Change-Id: I0f63f44adddeac5994b6fb3c3cd2e5a62ef9fe92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341401
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798943}