Remove SVGLocatable and SVGTransformable

These interfaces are removed from SVG2 spec. Move interfaces to SVGGraphicsElement
and parsing utilities to SVGParserUtilities.

Review URL: https://codereview.chromium.org/61753005

git-svn-id: svn://svn.chromium.org/blink/trunk@161755 bbb929c8-8fbe-4397-9dbb-9b2b20218538