LoginManagerParent expects either a CPOW or a DOM node (in the non-e10s case) to
be passed as the inputElement for LoginManagerParent.fillForm. In bug 1360406,
we serialized the target in the content process so that the parent didn't have
access to the CPOW anymore.
This patch adds a targetAsCPOW property to the nsContextMenu solely for passing
back and forth between the parent and content processes in order to refer to
the target DOM node.
MozReview-Commit-ID: IMwVK0Ewlhy
