The optional Isolate parameter will be removed once all call sites have an Isolate. It will require several patches.
Created attachment 185919 [details] Patch
Comment on attachment 185919 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=185919&action=review > Source/WebCore/ChangeLog:3 > + [V8] Add a temporal optional Isolate parameter to HasInstance() temporal -> temporary
Committed r141553: <http://trac.webkit.org/changeset/141553>