Bug 928283- Added button back
Bug 929287: Only create mozContact if we don't already have one.
Merge pull request #13007 from wanderview/contacts-webidl-delete

Bug 929287: Only create mozContact if we don't already have one.  r=arcturus
Merge pull request #12936 from gitmai/bug-928283-back-sim-pin

Bug 928283- Added button back (r=fcampo)