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Constants for https, http already exists in our_constants. This patch makes gurl use those constants instead of hrad-coded values. Also it adds constants for WS and WSS.

Review URL: https://codereview.chromium.org/301353003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274179 0039d316-1c4b-4281-b951-d872f2087c98