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This CL converts MediaCapsRequest and MediaCapsPtr to
new Mojo types.

Bug: 955171
Change-Id: I8fd9b87f2027b5abc3ffbfda942894eaf19e5865
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1788430
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@{#695534}