Remove unused runtime enabled features

Reverts the addition of CanvasPathEnabled setting. It had no effect since
it only changed the unused RuntimeEnabledFeatures.

WebKit ChangeLog:
https://bugs.webkit.org/show_bug.cgi?id=123509

Some of the runtime enabled features were only ever used by the V8 bindings
and can be removed as no WebKit code sets or reads them.

* bindings/generic/RuntimeEnabledFeatures.cpp:
(WebCore::RuntimeEnabledFeatures::RuntimeEnabledFeatures):
* bindings/generic/RuntimeEnabledFeatures.h:

Change-Id: Ie15d05d6e27e5edb62cc5ce00fd59258df8ec2d7
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@158269 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>