Thread IO safety: net/disk_cache file I/O in recovery.
Thread IO safety: net/disk_cache file I/O in recovery.

DelayedCacheCleanup() generates a new filename (and checks for
existence) then moves the cache there.  I'm seeing this on the I/O
thread when my cache is corrupt.

BUG=61151
TEST=none

Review URL: http://codereview.chromium.org/4088006

git-svn-id: http://src.chromium.org/svn/trunk/src@64353 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a323611bf6a60cb69e4c342c347f204b9b51da0d
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser