Add data reduction functionality to all platforms.
* Remove all #if defined guards from data reduction proxy functionality.
* Hard code proxy urls in params rather than providing them in gyp files.
* Add DataCompressionProxyRollout field trial to all platforms.
* Pass in bypass duration into UpdateRetryInfoOnFallback rather than computing
it based on SPDY_PROXY_AUTH_ORIGIN. Remove unused UMAs.
BUG=384394,384397
Review URL: https://codereview.chromium.org/
382313003
Cr-Commit-Position: refs/heads/master@{#296122}