Reviewed by Eric Seidel.

        https://bugs.webkit.org/show_bug.cgi?id=25303
        No need to ref the internal buffer inside the Skia ImageDecoder.

        * platform/image-decoders/skia/ImageDecoder.h:
        (WebCore::RGBA32Buffer::RGBA32Buffer):
        (WebCore::RGBA32Buffer::operator=):
        (WebCore::RGBA32Buffer::clear):
        (WebCore::RGBA32Buffer::copyBitmapData):
        (WebCore::RGBA32Buffer::bitmap):
        (WebCore::RGBA32Buffer::setSize):
        (WebCore::RGBA32Buffer::width):
        (WebCore::RGBA32Buffer::height):
        (WebCore::RGBA32Buffer::hasAlpha):
        (WebCore::RGBA32Buffer::setStatus):
        (WebCore::RGBA32Buffer::setHasAlpha):
        (WebCore::RGBA32Buffer::setRGBA):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@43244 268f45cc-cd09-0410-ab3c-d52691b4dbfc