Merge mozilla-central to fx-team

accessible/base/TextAttrs.h

dom/base/nsScriptLoader.cpp

dom/base/nsXMLContentSerializer.h

dom/canvas/CanvasRenderingContext2D.cpp

dom/canvas/ImageBitmap.cpp

dom/filesystem/GetFilesHelper.cpp

dom/filesystem/GetFilesHelper.h

dom/html/HTMLMediaElement.cpp

dom/html/HTMLMediaElement.h

dom/xul/templates/nsXULSortService.h

gfx/gl/GLScreenBuffer.cpp

js/src/asmjs/WasmBinary.h

js/src/asmjs/WasmCompile.h

js/src/asmjs/WasmModule.cpp

js/src/jit-test/tests/ion/for-in-iterator-1.js

js/src/jit/BaselineIC.cpp

js/src/jit/CodeGenerator.cpp

js/src/jit/CodeGenerator.h

js/src/jit/Lowering.cpp

js/src/jit/MIR.h