Fix up testharness. (#189)
Fix up testharness. (#189)

There were quotes around the test harness path in the project that was making
it so Xcode couldn't find it to run it.
google/google-toolbox-for-mac,thomasvl/google-toolbox-for-mac,google/google-toolbox-for-mac,thomasvl/google-toolbox-for-mac