Remove all the files in the temp directory on a slave, instead of a whitelist of files.
Remove all the files in the temp directory on a slave, instead of a whitelist of files.

The current whitelist still left > 60K files on some windows trybots, and that led to an increase of 15-20 minutes per try job on the most cluttered bots.

BUG=399109

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=286846

Review URL: https://codereview.chromium.org/431863002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@286896 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build