[WebIDL] Annotate IDL interfaces under Source/WebCore/plugins/ with the OperationsNot...

[WebIDL] Annotate IDL interfaces under Source/WebCore/plugins/ with the OperationsNotDeletable attribute
https://bugs.webkit.org/show_bug.cgi?id=122273

Reviewed by Darin Adler.

Before changing the JSC bindings generator to enforce WebIDL operations to be configurable, all the
interfaces are being annotated with the OperationsNotDeletable attribute. The attribute currently
doesn't have any effect, but will keep the operations not configurable after the generator is modified
to preserve the original behavior. The attribute will be removed from each interface after checking
conformity with other browsers (in terms of configurability of operations of that interface) and the
WebKit's existing test suites.

This patch covers IDL interfaces under Source/WebCore/plugins/.

* plugins/DOMMimeTypeArray.idl:
* plugins/DOMPlugin.idl:
* plugins/DOMPluginArray.idl:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@156884 268f45cc-cd09-0410-ab3c-d52691b4dbfc