Now that WebKit r97497 is rolled into Chromium, we no longer need the legacy
interface. As a bonus, the last of the Clipboard::readHTML crashes should be
fixed.
BUG=19360
TEST=ui_unittests and WebKit layout tests
Review URL: http://codereview.chromium.org/8305012
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@105611 0039d316-1c4b-4281-b951-d872f2087c98