This conflicts with adding them to HTMLElement for custom layout.
I grepped the codebase and couldn't find any uses of these. The
big thing we lose here is a way to set width/height on an image
that automatically maintains aspect ratio, but that's something
we should move into a custom layout method anyways.
R=eseidel@chromium.org
Review URL: https://codereview.chromium.org/1060443002
This removes the attributes sky doesn't intend to support. It
removes references to the attrs, but leaves behind a lot of
plumbing that will be cleaned up in the future. This at least
removes the API surface.
R=ojan@chromium.org
Review URL: https://codereview.chromium.org/855803002
