This is down to:
* device_emulator_message_handler.cc
* keyboard_overlay_ui.cc

keyboard_overlay_ui.cc is marked as deprecated for KSV, but the dependency is pretty minor and can be replaced with an existing cros_display_config mojo API call. jamescook@ - Do you think that is worth fixing?

There are also some c/b/ui/webui/chromeos/login dependencies but those are tracked separately (issue 856375,  issue 678990 )

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cbcb900ab0d31c8894d9dff81cbfcd28338d5b7b

commit cbcb900ab0d31c8894d9dff81cbfcd28338d5b7b
Author: Steven Bennetts <stevenjb@chromium.org>
Date: Fri Jul 27 21:08:45 2018

BluetoothDialog cleanup: Pass non cannonical address

In the two (soon to be three) places where we call
BluetoothPairingDialog::ShowDialog, we first call
device::BluetoothDevice::CanonicalizeAddress(address).

We should do this in the ShowDialog call instead to simplify the
calling code.

Bug:  756094 
Change-Id: Ie4b6ee4935bd9a632e231f5c07b4830fc590a832
Reviewed-on: https://chromium-review.googlesource.com/1153573
Reviewed-by: Xiaoyin Hu <xiaoyinh@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578793}
[modify] https://crrev.com/cbcb900ab0d31c8894d9dff81cbfcd28338d5b7b/chrome/browser/chromeos/arc/bluetooth/arc_bluetooth_bridge.cc
[modify] https://crrev.com/cbcb900ab0d31c8894d9dff81cbfcd28338d5b7b/chrome/browser/ui/ash/system_tray_client.cc
[modify] https://crrev.com/cbcb900ab0d31c8894d9dff81cbfcd28338d5b7b/chrome/browser/ui/webui/chromeos/bluetooth_pairing_dialog.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d93806abedf4ff5855dda6ddb6587eedd373ae68

commit d93806abedf4ff5855dda6ddb6587eedd373ae68
Author: Steven Bennetts <stevenjb@chromium.org>
Date: Fri Jul 27 21:42:50 2018

Device Emulator: Call BluetoothDialog directly

Bug:  756094 
Change-Id: Ic492595a0b79202157d6b7ad9c588c518f417f92
Reviewed-on: https://chromium-review.googlesource.com/1116183
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578815}
[delete] https://crrev.com/54086c2188f344c1ac126577a88c1c767f7f9230/chrome/browser/ui/webui/chromeos/emulator/DEPS
[modify] https://crrev.com/d93806abedf4ff5855dda6ddb6587eedd373ae68/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.cc
[modify] https://crrev.com/d93806abedf4ff5855dda6ddb6587eedd373ae68/chrome/browser/ui/webui/chromeos/emulator/device_emulator_message_handler.h

I wouldn't bother fixing keyboard_overlay_ui.cc. I think we'll be deleting it either late this milestone or early next.

The only remaining task here is  https://crbug.com/678990 , closing this issue.