Delete mus surfaces hit testing
There's a ton of cc plumbing through the window server to
support surfaces hittesting. This code exists to support
out of process iframes but has been disabled for while.
With the mus-ws / mus-gpu split, this code will change
radically anyway. To avoid refactoring dead code, I'm
deleting it first, and we may reintroduce it in mus-gpu in
the future in some new and improved form.
BUG=612636,610937
Review-Url: https://codereview.chromium.org/1987133002
Cr-Commit-Position: refs/heads/master@{#394432}
13 files changed
