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This moves the display scanning code to always be in the
DesktopCapturerProxy (DCP). Previously, it was located in the
DesktopSessionAgent (DSA) for Windows and in the DCP for Mac.

The change to record the display id along with the geometry info
broke Windows because that info was calculated in the DSA, but
not available in the DCP. By moving all the display scanning into
the DCP, this problem is fixed.

This also removes the duplicate code and increases the likelihood
that it2me will "just work".

This works because, on Windows Me2me, the DSA serves as the
ClientSessionController, and passes the message across the process
boundary to the real ClientSessionController.

Bug: 915411
Change-Id: Iecdd827b82c5e75e4a493f31cc31a6555388d4ca
Reviewed-on: https://chromium-review.googlesource.com/c/1485016Reviewed-by: Joe Downing <joedow@chromium.org>
Commit-Queue: Gary Kacmarcik <garykac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635183}