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This CL converts MediaDrmStorage{Ptr, Request} in android_webview,
chrome, chromecast components and media to the new Mojo type.

Bug: 955171
Change-Id: I3a8eb5bd33128659fd09804368e96afb08ce03c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1871695
Commit-Queue: Miyoung Shin <myid.shin@igalia.com>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711987}