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2. Adds a couple of functions to return different fingerprint value for tamper detection.

3. Adds a function to remove Chrome-Proxy header's fingerprint from its header values, and return the rest of header values.

4. Changes HasDataReductionProxyViaHeader to also tell 
whether data reduction proxy Via header occurs at the last 
or not.


BUG=381907

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287561

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287855

Review URL: https://codereview.chromium.org/387353003

Cr-Commit-Position: refs/heads/master@{#288272}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288272 0039d316-1c4b-4281-b951-d872f2087c98