The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc

commit bcd4dffd735a04da55c91ebe7f1959ddb8be36fc
Author: Yutaka Hirano <yhirano@chromium.org>
Date: Wed Jul 18 07:16:35 2018

Revert "chromeos: makes ScreenProviderObserver an associated interface"

This reverts commit b4e6da646f25cca291318e50e7aa9dd05173dd65.

Reason for revert: Broke PolicyDisplayRotationDefault/DisplayRotationBootTest.Reboot/*

Original change's description:
> chromeos: makes ScreenProviderObserver an associated interface
> 
> And changes ws2 to ensure client is notified when scale-factor changes.
> The conversion from ScreenProviderObserver to associated interface is to
> ensure the ScreenProviderObserver is notified *before* the bounds change
> because of scale-factor. To do otherwise means the client might use the wrong
> scale-factor.
> 
> BUG=862409
> TEST=none
> 
> Change-Id: I78333dcabe3e4adb1e2091cba784d53d9c27be1a
> Reviewed-on: https://chromium-review.googlesource.com/1138866
> Reviewed-by: Tom Sepez <tsepez@chromium.org>
> Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
> Commit-Queue: Scott Violet <sky@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#575799}

TBR=sadrul@chromium.org,sky@chromium.org,tsepez@chromium.org

Change-Id: Iccd11134913aa340630f422d471f9047661d36a4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 862409,  864902 
Reviewed-on: https://chromium-review.googlesource.com/1141584
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575964}
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/ash/app_launch_unittest.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/ash/display/window_tree_host_manager.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/content/renderer/mus/renderer_window_tree_client.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/content/renderer/mus/renderer_window_tree_client.h
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/public/interfaces/screen_provider.mojom
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/public/interfaces/window_tree.mojom
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws/test_utils.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws/test_utils.h
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws/window_tree_client_unittest.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/BUILD.gn
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/client_root.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/client_root.h
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/screen_provider.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/screen_provider.h
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/screen_provider_unittest.cc
[delete] https://crrev.com/57186f5dff9d6a5215f6604ba4c897f919039ff2/services/ui/ws2/test_screen_provider_observer.cc
[delete] https://crrev.com/57186f5dff9d6a5215f6604ba4c897f919039ff2/services/ui/ws2/test_screen_provider_observer.h
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/test_window_tree_client.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/test_window_tree_client.h
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/window_service.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/window_service.h
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/window_service_test_setup.h
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/window_tree_binding.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/window_tree_binding.h
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/services/ui/ws2/window_tree_unittest.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/ui/aura/mus/window_tree_client.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/ui/aura/mus/window_tree_client.h
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/ui/aura/mus/window_tree_client_delegate.h
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/ui/views/mus/mus_client.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/ui/views/mus/mus_client.h
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/ui/views/mus/screen_mus.cc
[modify] https://crrev.com/bcd4dffd735a04da55c91ebe7f1959ddb8be36fc/ui/views/mus/screen_mus.h