All temporary files created by downloads.py should be deleted
All temporary files created by downloads.py should be deleted

This is so that the bot does not run out of disk space

BUG=None
TEST=None

R=rdsmith@chromium.org

Review URL: http://codereview.chromium.org/8510035

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@109370 0039d316-1c4b-4281-b951-d872f2087c98

gavinp/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,ropik/chromium,ropik/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,ropik/chromium,adobe/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,adobe/chromium,gavinp/chromium