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This is so I can introduce a new way to do PPP interfaces that are
passed to a related PPB interface, instead of using PPP_GetInterface.

Note this doesn't add support for the PNaCl shim yet, although it should
at least make it compile.

BUG=367896

Review URL: https://codereview.chromium.org/281203002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271425 0039d316-1c4b-4281-b951-d872f2087c98