Making fileutils test handle any checkout dir
Making fileutils test handle any checkout dir

This is needed since the checkout dir is not always named 'trunk', e.g. on branches and buildbot checkouts.

BUG=Tests fails if checkout dir is not named trunk.
TEST=test_support_unittests in a couple of different working directory setups.

Review URL: https://webrtc-codereview.appspot.com/915004

git-svn-id: 917f5d3ca488f358c4d40eaec14422cf392ccec9@2957 4adac7df-926f-26a2-2b94-8c16560cd09d

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