Provide better message and ensure rmdir is in a loop for the failure case (which occurred inside UpdateBundle).  This moves the RemoveDir into the 'repeat up to 100 times' loop, and enhances the error message.
Provide better message and ensure rmdir is in a loop for the failure case (which occurred inside UpdateBundle).  This moves the RemoveDir into the 'repeat up to 100 times' loop, and enhances the error message.


BUG=http://code.google.com/p/nativeclient/issues/detail?id=2304
TEST=BOTS + manual
Review URL: http://codereview.chromium.org/8227019

git-svn-id: e22621a84199d42b34715cdc089545aeedbbf23f@1250 050acbb0-2703-11df-ab0a-9f3f633ae91d

sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk