Fix testBigZip on chromeos
Fix testBigZip on chromeos

1. Don't check for disk space while creating temp file, because we don't really make a large file.
2. Fix the snag where disk space for the wrong file was being checked before
downloading

BUG=None
TEST=tesgBigzip pass on chromeos

R=dennisjeffrey@chromium.org


Review URL: http://codereview.chromium.org/9169077

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@119403 0039d316-1c4b-4281-b951-d872f2087c98

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