Fix rm command for class cleanup in r7091
Fix rm command for class cleanup in r7091

In https://webrtc-codereview.appspot.com/20339004
the rm command was missing 'r' for recursive mode.

TBR=henrike@webrtc.org
BUG=

Review URL: https://webrtc-codereview.appspot.com/26379004

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@7092 4adac7df-926f-26a2-2b94-8c16560cd09d

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