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Currently, when creating relay sessions the Transport API can make
cross-origin http requests only when the web app has explicit access to
the relay domain. This is not really neccessary because Transport API
can only be used by chromoting client plugin which is trusted.
PPB_URLLoader API allows cross-origin requests for trusted plugins, so
Transport API should be allowed to make them too. Changed
API implementation to allow cross-origin requests.

BUG=103992,104195

Review URL: http://codereview.chromium.org/8566012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@109973 0039d316-1c4b-4281-b951-d872f2087c98