add a detructor for clang's sake.
add a detructor for clang's sake.

BUG=there is no bug
TEST=not applicable



git-svn-id: http://src.chromium.org/svn/trunk/src@76872 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 220350fbf208b018b36bd02d7cecaa1981d023e0
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