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This CL converts WiFiDisplaySessionService{Ptr, Request} in
extensions to the new Mojo type.

Bug: 955171
Change-Id: I5eba79faacfb08a099feeca4d003270f21c5364a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862456Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Cr-Commit-Position: refs/heads/master@{#706313}