We just fixed an overflow but test was removed for easier merge. This just adds the test:

Here is the fix:
https://codereview.chromium.org/175543002/

BUG=345426
TBR=danakj@chromium.org

Carrying forward LGTM from prior patch.

Review URL: https://codereview.chromium.org/165773004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253051 0039d316-1c4b-4281-b951-d872f2087c98
Move appcache_test_helper.* to content/public/test/

BUG=338338
TBR=darin@chromium.org

Review URL: https://codereview.chromium.org/158323005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253052 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253052