[TreatNullAs=EmptyString, TreatUndefinedAs=EmptyString]
https://bugs.webkit.org/show_bug.cgi?id=77611

Reviewed by Adam Barth.

This patch renames [ConvertUndefinedOrNullToNullString] to
[TreatNullAs=EmptyString, TreatUndefinedAs=EmptyString], according to the spec
(http://dev.w3.org/2006/webapi/WebIDL/#TreatNullAs,
http://dev.w3.org/2006/webapi/WebIDL/#TreatUndefinedAs).

No tests. No changes in behavior.

* bindings/scripts/CodeGeneratorJS.pm:
(JSValueToNative):
* bindings/scripts/CodeGeneratorV8.pm:
(GetNativeTypeFromSignature):
* dom/DOMImplementation.idl:
* dom/Document.idl:
* fileapi/Blob.idl:
* fileapi/DirectoryEntry.idl:
* fileapi/DirectoryEntrySync.idl:
* fileapi/Entry.idl:
* fileapi/EntrySync.idl:
* fileapi/WebKitBlobBuilder.idl:
* html/HTMLButtonElement.idl:
* html/HTMLCanvasElement.idl:
* html/HTMLFieldSetElement.idl:
* html/HTMLInputElement.idl:
* html/HTMLKeygenElement.idl:
* html/HTMLObjectElement.idl:
* html/HTMLOutputElement.idl:
* html/HTMLSelectElement.idl:
* html/HTMLTextAreaElement.idl:
* page/Console.idl:
* page/DOMWindow.idl:

* bindings/scripts/test/TestObj.idl: No changes in run-bindings-tests results.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106575 268f45cc-cd09-0410-ab3c-d52691b4dbfc