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Before this CL, AppCacheServiceImpl took a QuotaManagerProxy* argument,
then stored the value in a scoped_refptr. This CL updates the
constructor signature to make it clear that the constructor saves a
reference to the QuotaManagerProxy, and propagates this update to
ChromeAppCacheService.

Change-Id: Iee7d9459e4839a5a0e7b5a454adb593aca2f1e4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2513231
Commit-Queue: enne <enne@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823834}