Implement FileRef GetPathPrivate interface for O3D

This is an implementation of a new private interface to get the filepath of a file downloaded with URLLoader and URLRequestInfo.SetStreamToFile(true). The file will be read in its entirety during a successful URLLoader.FinishStreamingToFile callback.

BUG=none
TEST=none


Review URL: http://codereview.chromium.org/8604006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111805 0039d316-1c4b-4281-b951-d872f2087c98
12 files changed