history.{push,replace}State should no longer be V8EnabledAtRuntime

http://trac.webkit.org/changeset/55549 made them be runtime-enabled (since the
Chromium implementation was not complete at the time), but they've been enabled
by default since http://crrev.com/41850.

As of http://trac.webkit.org/changeset/127674, WebRuntimeFeatures::enablePushState is a no-op.

R=darin@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10914102

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@155205 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed