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This is a reland of 126c42bd

There was no build error on Android with is_asan=true option.
So, the original CL was not the culprit of the build error.
Merge the original CL again.

Original change's description:
> Migrate CdmFactory to new Mojo type
>
> This CL applies pending_receiver to CreateCdm function
> in CdmFactory interface. Additionally, this CL converts
> mojo::StrongBindingSet to mojo::UniqueReceiverSet.
>
> Bug: 955171
> Change-Id: I4bc983708e394800c3a31d3d6a598a39381fa3b5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1826755
> Reviewed-by: Dominick Ng <dominickn@chromium.org>
> Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
> Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
> Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
> Cr-Commit-Position: refs/heads/master@{#700895}

Bug: 955171
Change-Id: I05175a44c4543cf6e2f99a710480a05377a5db50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1830477Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#704119}