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This change makes the DataReductionProxyInterceptor intercept redirects
as well as responses. This will cause clients on captive portal networks
that cause redirect loops when trying to use Data Saver bypass
immediately instead of waiting for 21 redirects.

BUG=460346

Review URL: https://codereview.chromium.org/958163004

Cr-Commit-Position: refs/heads/master@{#319120}