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This CL converts ApplicationMediaCapabilitiesRequest
and ApplicationMediaCapabilitiesPtr to  new Mojo types.
It uses ReceiverSet and PendingRemote or Remote instead
of BindingSet and ApplicationMediaCapabilitiesPtr.

Bug: 955171
Change-Id: I4b03e7bc1c4412e370d2fbd95d812a0ee53a08dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1786705
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695556}