Fixes generation of incorrect links for FileDiffResource children in Web API

Review Request #3020 — Created March 26, 2012 and submitted — Latest diff uploaded

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This fixes a bug which causes generation of broken links for FileDiffResource children in the Web API.

FileDiffResource was explicitly generating its own URL incorrectly.
Ran unit tests, and manually browsed the API confirming fix, and looking for other breakages.