Ship ImageBitmap and createImageBitmap

Now that we have 3 LGTMs for ImageBitmap and createImageBitmap to ship:
https://groups.google.com/a/chromium.org/d/topic/blink-dev/jRzvehX9U1U/discussion,
let's ship it and expose it to larger audience!

This CL removes the Runtime flag in ImageBitmapFactories.idl and updates
some global interface layout tests results.

BUG=249384

Review URL: https://codereview.chromium.org/1636633002

Cr-Commit-Position: refs/heads/master@{#371340}
5 files changed