Remove unused runtime setting qtkitenabled
Remove unused runtime setting qtkitenabled

This setting existed in WebKit but Chromium never changed it from its default value. We're removing all such unchanging settings in Blink, along with their associated code.

R=abarth@chromium.org
BUG=226711

Review URL: https://codereview.chromium.org/13616007

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@147729 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs