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This CL converts ProvisionFetcher{Ptr, Request} in media and
content to the new Mojo type.

Bug: 955171
Change-Id: If6bf828080e81389209404050145849f6249f7c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1882265
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710289}