Disk cache: Make sure that we don't leak file handles (even on leaky tests) because that may cause failures with other tests.
Disk cache: Make sure that we don't leak file handles (even on leaky tests)
because that may cause failures with other tests.

BUG=122005
TEST=net_unittests
Review URL: https://chromiumcodereview.appspot.com/10140031

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@134160 0039d316-1c4b-4281-b951-d872f2087c98

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