Use Persistent::Reset.

This gets rid of more places where Persistent handles are copied
(see bug).

BUG=236290
TBR=cbenzel@chromium.org
TBR=eroman@chromium.org

Review URL: https://chromiumcodereview.appspot.com/14746011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@199809 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed