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This permits WebSocket connections to inherit credentials from HTTP pages, and
matches the behaviour of other browsers.

Design doc: https://docs.google.com/a/chromium.org/document/d/129rLtf5x3hvhP5rayLiSxnEjOXS8Z7EnLJgBL4CdwjI/edit

Also consider any 401 or 407 results that reach the WebSocketStream
URLRequest::Delegate to be unrecoverable errors.

Also ensure that the response headers are reported back to the renderer
when the developer tools are open and a 401 error happens.

BUG=123862

Review URL: https://codereview.chromium.org/336263005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282307 0039d316-1c4b-4281-b951-d872f2087c98