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This reverts commit c64eed06.

Reason for revert: Broke virtual/eye-dropper/color-picker-show-eye-dropper.html on WebKit Linux MSAN

Original change's description:
> Add security mitigations for eye dropper IPC.
>
> As discussed on the security review this CL adds the following mitigations:
> - require a transient user activation on the browser side, and consume
> it when showing the eye dropper for the renderer (this will prevent a
> compromised renderer to repeatedly ask for a color)
> - require the eye dropper UI to be visible for a minimum amount of time
> before color selection is allowed in order to ensure the user has a
> chance to see the UI.
>
> There is also a fix for the popup not correctly updating the user
> activation state. This happens because it is using a
> EmptyLocalFrameClient and its frame is not related to the
> owner element's frame.
>
> Bug: 992297
> Change-Id: Ia5d2aead0be153ce4b49048552062de3a6c72e63
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2442132
> Reviewed-by: Kent Tamura <tkent@chromium.org>
> Reviewed-by: Mason Freed <masonfreed@chromium.org>
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Commit-Queue: Mason Freed <masonfreed@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#812847}

TBR=avi@chromium.org,danakj@chromium.org,tkent@chromium.org,masonfreed@chromium.org,iopopesc@microsoft.com
NOTRY=true

Bug: 992297
Change-Id: If16db478fb59c4caa6f4fd90190adb72ce38e68a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2448054
Commit-Queue: Chris Sharp <csharp@chromium.org>
Reviewed-by: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813723}