rename only
Bug 958782 - 1/3: B2G SMS - Move MozMobileMessage to WebIDL. XPIDL & WebIDL changes.
Bug 958782 - 2.a/3: refactoring, alignments.
Bug 958782 - 2.b/3: implementation.
Bug 958782 - 2.c/3: remove unused headers and sort.
Bug 958782 - 3/3: fix test cases.