Remove deadcode from RenderObject and RenderBlock

This patch removes deadcode from RenderObject and RenderBlock. This
was generated using an internal tool and put together manually.

Review URL: https://codereview.chromium.org/115763002

git-svn-id: svn://svn.chromium.org/blink/trunk@163911 bbb929c8-8fbe-4397-9dbb-9b2b20218538