[SVG] remove SVGListProperty*.h

The file is no longer referenced from anywhere.
These functionality has moved to NewSVGListPropertyHelper.h

BUG=349370
TBR=haraken,pdr,fs
NOTRY=true

Review URL: https://codereview.chromium.org/190213002

git-svn-id: svn://svn.chromium.org/blink/trunk@168707 bbb929c8-8fbe-4397-9dbb-9b2b20218538