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This passes the response headers through to the API callback allowing the
application to access the headers without having to make an additional
http request.

BUG=303491

Review URL: https://codereview.chromium.org/185663002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255593 0039d316-1c4b-4281-b951-d872f2087c98