Move image/map role determination to the browser side

An image always has Role::kImage in Blink.
The browser side now exposes it as an image map if there are children.

Bug: None
Change-Id: Idf5bfe1caa3317e6dbdaea8f24845e5883932361
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2744234
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#861644}
GitOrigin-RevId: 9342f9ad6e9e738808a3aaa3ab8ac5b8f7ec03f9
1 file changed