GitLab

This CL removes the tooltip IPC code from BrowserPlugin and
BrowserPluginGuest. This code is no longer in use since mouse events
are directly routed to the guest, and no longer go through the
embedder.

Bug: 533069
Change-Id: I916b534d86faf81d64f855368d055f8faccaf440
Reviewed-on: https://chromium-review.googlesource.com/895192Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533717}