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Make the DataCompressionProxyDevRollout trial be able to override both the primary host and the fallback host of the data reduction proxy.

Related Chrome Android CL:
https://chrome-internal-review.googlesource.com/#/c/175697/

BUG=410961

Review URL: https://codereview.chromium.org/549153003

Cr-Commit-Position: refs/heads/master@{#294035}