Pass along RunCommandException correctly. This is a minor fix, but it leads to better error messages from ctest.
Pass along RunCommandException correctly. This is a minor
fix, but it leads to better error messages from ctest.

Change-Id: I624ad805ef037b022e6e67b56f0ed10ca05fe325

BUG=11096
TEST=Test currently in progress.

Review URL: http://codereview.chromium.org/6257007

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