Disk cache: Reset the number of fatal errors each time we report it and make sure that we don't report it more than once a week.
Disk cache: Reset the number of fatal errors each time
we report it and make sure that we don't report it more
than once a week.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6410044

git-svn-id: http://src.chromium.org/svn/trunk/src@73829 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 6c1488da67f2c5c6a72ed301beb5713091eb9ccc
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