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This reverts commit a98a8fa4.

Reason for revert: causing test failure

Original change's description:
> media: Trigger Infobar on Mac ARM on EME query failure
> 
> CDM on Mac ARM is not ready yet. When requestMediaKeySystemAccess()
> fails on Mac ARM, we reject the promise with "Unsupported platform" and
> trigger an infobar to notify user. The infobar will be triggered at most
> once per render process.
> 
> Since the infobar can only be triggered in the browser process, a new
> mojo service CdmInfobarService is added. Note that even though there
> already exists KeySystemSupport service, which is also implemented in
> the browser process, we cannot trigger the infobar there, because the
> infobar requires a WebContents context, while the KeySystemSupport
> service is bound to a render process instead of a render frame.
> 
> Change-Id: Ia85a1f2b097b0c2d26d12cc3e9363c34a25691a3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404716
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
> Reviewed-by: John Rummell <jrummell@chromium.org>
> Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#807631}

TBR=ellyjones@chromium.org,dcheng@chromium.org,xhwang@chromium.org,jrummell@chromium.org

Change-Id: Ia3e06b8685f70b3e3e000df2bbf24054bcc97ada
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414759Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807649}