[WebIDL] Simplify [EnabledBySettings] extended attribute code to not require passing...

[WebIDL] Simplify [EnabledBySettings] extended attribute code to not require passing a global object to finishCreation
https://bugs.webkit.org/show_bug.cgi?id=175087

Patch by Sam Weinig <sam@webkit.org> on 2017-08-02
Reviewed by Chris Dumez.

* bindings/scripts/CodeGeneratorJS.pm:
(GenerateImplementation):
(GeneratePrototypeDeclaration):
Remove unnecessary passing of the global object to finishCreation for [EnabledBySettings].

* bindings/scripts/test/JS/JSTestGenerateIsReachable.cpp:
* bindings/scripts/test/JS/JSTestNode.cpp:
* bindings/scripts/test/JS/JSTestObj.cpp:
Update tests.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@220176 268f45cc-cd09-0410-ab3c-d52691b4dbfc