Avoid drawing SVG image content when the image is of zero size.

R=pdr
BUG=330420

Review URL: https://codereview.chromium.org/109753004

git-svn-id: svn://svn.chromium.org/blink/trunk@164536 bbb929c8-8fbe-4397-9dbb-9b2b20218538
void RenderSVGImage::invalidateBufferedForeground()
{
    m_bufferedForeground.clear();
}

void RenderSVGImage::invalidateBufferedForeground()
{
    m_bufferedForeground.clear();
}
