Revert "Add Views DesktopMediaPicker into the Overall Views Build"

This reverts commit 59da623a9597b60252f1c657add234eecbb30918.

Reason for revert: This work was just deprioritized, so the investigation into the bot only failures is now on the backburner.

Original change's description:
> Add Views DesktopMediaPicker into the Overall Views Build
> 
> This moves the code into the toolkit_views source list and gates Aura
> specific code behind build flags.
> 
> Additionally, this links up DesktopMediaPicker::Create in a manner
> similar to ScreenCaptureNotificationUI::Create[Cocoa].
> 
> BUG=726005,657883
> NOAUTOREVERT=true
> Need to investigate any failure on the Mac Bot. Not reproducible locally.
> 
> Change-Id: I9ece0b875268495d70154378c7608c3e1bae2938
> Reviewed-on: https://chromium-review.googlesource.com/1102042
> Commit-Queue: Robert Liao <robliao@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#569095}

TBR=ellyjones@chromium.org,sky@chromium.org,robliao@chromium.org

Change-Id: Ice2800851d19895e687525bc63b8afa9d1746517
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 726005, 657883
Reviewed-on: https://chromium-review.googlesource.com/1110897
Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569377}
8 files changed