Disk cache: Fix the path for stress_cache.
Disk cache: Fix the path for stress_cache.

r29136 broke the temp path used for stress_cache.
I'm switching it back to the desired location (it should
not interfere with the path for net_unittests).

BUG=none
TEST=none



Review URL: http://codereview.chromium.org/3300019

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@59004 0039d316-1c4b-4281-b951-d872f2087c98

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