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The data reduction proxy client should be specific about it's capabilities by specifying the version of the proxy client that is being used. 
A version field is now added to the Chrome-Proxy header in requests, but that version is set to zero. 
This corrects the version field in the Chrome-Proxy header to be the chromium build and patch number.

BUG=367268

Review URL: https://codereview.chromium.org/430643002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287970 0039d316-1c4b-4281-b951-d872f2087c98