Backed out changesets 950a3afc2b15 and dfb5303af6f9 (bug 1028288) for being incorrect

dom/canvas/CanvasRenderingContext2D.cpp

dom/canvas/CanvasRenderingContext2D.h

gfx/thebes/gfxDrawable.cpp

gfx/thebes/gfxDrawable.h

gfx/thebes/gfxUtils.cpp

gfx/thebes/gfxUtils.h

image/src/VectorImage.cpp

image/src/VectorImage.h

...t/reftests/svg/as-image/canvas-drawImage-alpha-1-ref.html

layout/reftests/svg/as-image/canvas-drawImage-alpha-1.html

...t/reftests/svg/as-image/canvas-drawImage-alpha-2-ref.html

layout/reftests/svg/as-image/canvas-drawImage-alpha-2.html

layout/reftests/svg/as-image/reftest.list

layout/reftests/svg/as-image/squaredCircle-transparent.svg

layout/svg/SVGImageContext.h