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The AppCacheUpdateJob::URLFetcher cancels redirects in general.
This change allows redirects that are generated by the data
reduction proxy bypass mechanism. This is a workaround until
crbug.com/429505 is resolved.

BUG=429011

Review URL: https://codereview.chromium.org/695193002

Cr-Commit-Position: refs/heads/master@{#302558}