mac: When touching bundle directories, don't accidentally create them.
mac: When touching bundle directories, don't accidentally create them.

If the dependencies fail and the build runs with -k, the bundle
directory won't exist yet and touching it will create it as a regular
file instead of as a directory. Undesirable.

TBR=evan
Review URL: http://codereview.chromium.org/7411006

git-svn-id: e7e1075985beda50ea81ac4472467b4f6e91fc78@960 78cadc50-ecff-11dd-a971-7dbc132099af

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