Revert of Start of display management for mus

components/mus/ws/display_manager.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/mus/ws/display_manager.h"
 
 #include "base/numerics/safe_conversions.h"
 #include "build/build_config.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/delegated_frame_data.h"
@@ skipping 236 matching lines @@
   ui::Cursor cursor(cursor_id);
   cursor_loader_->SetPlatformCursor(&cursor);
   platform_window_->SetCursor(cursor.platform());
 #endif
 }
 
 const mojom::ViewportMetrics& DefaultDisplayManager::GetViewportMetrics() {
   return metrics_;
 }
 
-mojom::Rotation DefaultDisplayManager::GetRotation() {
-  // TODO(sky): implement me.
-  return mojom::Rotation::VALUE_0;
-}
-
 void DefaultDisplayManager::UpdateTextInputState(
     const ui::TextInputState& state) {
   ui::PlatformImeController* ime = platform_window_->GetPlatformImeController();
   if (ime)
     ime->UpdateTextInputState(state);
 }
 
 void DefaultDisplayManager::SetImeVisibility(bool visible) {
   ui::PlatformImeController* ime = platform_window_->GetPlatformImeController();
   if (ime)
@@ skipping 148 matching lines @@
 
 void DefaultDisplayManager::OnAcceleratedWidgetDestroyed() {
   NOTREACHED();
 }
 
 void DefaultDisplayManager::OnActivationChanged(bool active) {}
 
 }  // namespace ws
 
 }  // namespace mus