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This reverts commit cf3aebae.

Reason for revert: The new API breaks on X11 and Mac OSX.

Original change's description:
> [Desktop Capturer] Use new DesktopAndCursorComposer constructor
> 
> After several changes, we finally removed the dependency of SourceId in
> MouseCursorMonitor. Now DesktopAndCursorComposer provides a clearer
> constructor for its clients.
> 
> Bug: webrtc:7950
> Change-Id: I8716d736897637412e712fcc2b2d17ef0acf3eab
> Reviewed-on: https://chromium-review.googlesource.com/651147
> Commit-Queue: Zijie He <zijiehe@chromium.org>
> Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
> Reviewed-by: Weiyong Yao <braveyao@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#500761}

TBR=jamiewalch@chromium.org,braveyao@chromium.org,zijiehe@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: webrtc:7950, chromium:778035, chromium:778049
Change-Id: I45fbc68ae52194164828bc34207fe849850a98bf
Reviewed-on: https://chromium-review.googlesource.com/746947Reviewed-by: Weiyong Yao <braveyao@chromium.org>
Reviewed-by: Zijie He <zijiehe@chromium.org>
Commit-Queue: Zijie He <zijiehe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512976}