Switch lots of appendChild callers to AttachLazily

This switches most callers of appendChild to lazy attach. I left TextTrackCues since it looks
like it might need some more substantial refactoring and everything related to editing since
that code is more fragile.

This is part of making everything lazy attach, but I'm doing it slowly in steps to isolate
breakages and expose parts of the code that were making bad assumptions about when renderers
were created.

R=eseidel@chromium.org,ojan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/19134002

git-svn-id: svn://svn.chromium.org/blink/trunk@154731 bbb929c8-8fbe-4397-9dbb-9b2b20218538