Revert of Start of display management for mus

components/mus/ws/display_manager.h

Index: components/mus/ws/display_manager.h
diff --git a/components/mus/ws/display_manager.h b/components/mus/ws/display_manager.h
index 4bfa9d718603d644ac3c0e0c812e0fd1f3ed2c44..32f0c63135de4c709906650fb317c098ea38844b 100644
--- a/components/mus/ws/display_manager.h
+++ b/components/mus/ws/display_manager.h
@@ -14,7 +14,6 @@
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
 #include "build/build_config.h"
-#include "components/mus/public/interfaces/window_manager_constants.mojom.h"
 #include "components/mus/public/interfaces/window_tree.mojom.h"
 #include "components/mus/ws/display_manager_delegate.h"
 #include "mojo/public/cpp/bindings/callback.h"
@@ -54,7 +53,6 @@
 class ServerWindow;
 
 // DisplayManager is used to connect the root ServerWindow to a display.
-// TODO(sky): rename this given we have a mojom type with the same name now.
 class DisplayManager {
  public:
   virtual ~DisplayManager() {}
@@ -75,8 +73,6 @@
   virtual void SetTitle(const base::string16& title) = 0;
 
   virtual void SetCursorById(int32_t cursor) = 0;
-
-  virtual mojom::Rotation GetRotation() = 0;
 
   virtual const mojom::ViewportMetrics& GetViewportMetrics() = 0;
 
@@ -115,7 +111,6 @@
   void SetTitle(const base::string16& title) override;
   void SetCursorById(int32_t cursor) override;
   const mojom::ViewportMetrics& GetViewportMetrics() override;
-  mojom::Rotation GetRotation() override;
   void UpdateTextInputState(const ui::TextInputState& state) override;
   void SetImeVisibility(bool visible) override;
   bool IsFramePending() const override;