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DragDropClientMac is one of the few remaining structures that Cocoa
and Views code depends on. Break this dependency cycle, so that we can
move all Cocoa code to ui/views_brige_mac.
* Separate out the interface that Cocoa depends on and move it to
  views_bridge_mac::DragDropClient.
* Make views::DragDropClientMac be a member of the browser side
  structure views::BridgedNativeWidgetHostImpl

Note that this does not solve the problem that drag drop behavior is
not implemented over mojo. When using RemoteMacViews, drag drop
functionality will still be absent.

Bug: 859152
Change-Id: I3d5b8a3b8ae9403effd17436e727ba4298bcae61
Reviewed-on: https://chromium-review.googlesource.com/1244720Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594144}