
Migrating to paper-button within gr-button caused the property path of
the on-tap event to change (the target moved from gr-button to
paper-button), and the menu editor was not updated to reflect that.
Bug: Issue 8440
Change-Id: I3c40ff9c2dc338e9e905cb25eecb2853a92e5f66
(cherry picked from commit 8c346da3b3
)