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        Fix computeContainerBoundingBox to respect viewport translations
        https://bugs.webkit.org/show_bug.cgi?id=25254

        Previously computeContainerBoundingBox was just adding the viewportTranslation.
        Which, although it has a confusing name, only contains the scale and translation
        for the viewBox/preserveAspectRatio adjustment.  It does not contain the
        translation for the x/y offset of the viewport.
        localToParentTransform() does contain this offset, so we use that instead
        of the previous hacky code.

        * rendering/RenderSVGContainer.h:
        * rendering/RenderSVGViewportContainer.h:
        * rendering/SVGRenderSupport.cpp:
        (WebCore::computeContainerBoundingBox):

git-svn-id: svn://svn.chromium.org/blink/trunk@42599 bbb929c8-8fbe-4397-9dbb-9b2b20218538