Touch properties should be on the prototype

Touch properties should be on the prototype
https://bugs.webkit.org/show_bug.cgi?id=160174

Reviewed by Ryosuke Niwa.

Source/WebCore:

Touch properties should be on the prototype:
- https://w3c.github.io/touch-events/#idl-def-touch

Chrome agrees with the specification.

Test: platform/ios-simulator/ios/touch/Touch-attributes-prototype.html

* bindings/scripts/CodeGeneratorJS.pm:
(InterfaceRequiresAttributesOnInstanceForCompatibility): Deleted.

LayoutTests:

Add layout test coverage.

* platform/ios-simulator/ios/touch/Touch-attributes-prototype-expected.txt: Added.
* platform/ios-simulator/ios/touch/Touch-attributes-prototype.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@203707 268f45cc-cd09-0410-ab3c-d52691b4dbfc