Revert "GTTF: Add missing virtual destructors."

It turned out this is not necessary,
we have a better warning already enabled in clang
(-Wdelete-non-virtual-dtor, part of -Wall).

TBR=darin,satorux,fischman,jamesr,jar,sky

BUG=45135

Review URL: https://codereview.chromium.org/12224027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@180971 0039d316-1c4b-4281-b951-d872f2087c98
56 files changed