Bug 832153: Move SVGMaskElement to mozilla::dom r=bz

--HG--
rename : content/svg/content/src/nsSVGMaskElement.cpp => content/svg/content/src/SVGMaskElement.cpp
rename : content/svg/content/src/nsSVGMaskElement.h => content/svg/content/src/SVGMaskElement.h
Bug 832153 - Convert SVGMaskElement to WebIDL r=bz
Back out 06d0d20fbaf1 (bug 825379) for apparently causing bc perma-orange.
Bug 833931: Suppress unused-result warnings in OfflineCacheUpdateParent.cpp w/ mozilla::unused. r=mayhemer
Bug 792935 - Add tests for canPlayType for DASH (Media Mochitests) r=cpearce
Bug 792935 - Add DASH to gSmallTests and gSeekTests to manifest.js (Media Mochitests) r=cpearce
Bug 792935 - Add DASH to various Media Mochitests r=cpearce
Bug 792935 - Miscellaneous fixes for DASH Mochitests r=cpearce
Bug 792935 - Add decoder cloning support to DASH for mozLoadFrom r=cpearce
Bug 792935 - Do not close MPD resource before shutdown r=cpearce
Bug 792935 - Restore correct playState after state machine initialization r=cpearce
Bug 792935 - Forward suspend and resume to sub-decoders r=cpearce
Bug 833095 - Fix format of file notification when recording complete. r=mikeh