Fix cleanup_temp.py to not fail free space check on mac
Fix cleanup_temp.py to not fail free space check on mac

For a weird reason, mac minis always report that /home is full.
So stop checking /home on mac.

TBR=cmp@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/8907021

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@114266 0039d316-1c4b-4281-b951-d872f2087c98

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