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We never pass a null ChromeAppCacheService to AppCacheDispatcherHost so
don't bother trying to support that.

Bug: None
Change-Id: Ic8afd00a9ae405c31ca3bcdee8e87ba0beb4a9bd
Reviewed-on: https://chromium-review.googlesource.com/c/1450532
Auto-Submit: Marijn Kruisselbrink <mek@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628512}