chromeos: Changes DisplayManagerObserver to have a single function

services/ui/ws/display_manager.h

 // Copyright 2016 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.
 
 #ifndef SERVICES_UI_WS_DISPLAY_MANAGER_H_
 #define SERVICES_UI_WS_DISPLAY_MANAGER_H_
 
 #include <map>
 #include <memory>
 #include <set>
@@ skipping 38 matching lines @@
   void AddDisplay(Display* display);
   // Called when the window manager explicitly adds a new display.
   void AddDisplayForWindowManager(const display::Display& display,
                                   const display::ViewportMetrics& metrics);
   void DestroyDisplay(Display* display);
   void DestroyAllDisplays();
   const std::set<Display*>& displays() { return displays_; }
   std::set<const Display*> displays() const;
 
   // Notifies when something about the Display changes.
-  void OnDisplayUpdate(const display::Display& display);
+  void OnDisplayUpdated(const display::Display& display);
 
   // Returns the Display that contains |window|, or null if |window| is not
   // attached to a display.
   Display* GetDisplayContaining(const ServerWindow* window);
   const Display* GetDisplayContaining(const ServerWindow* window) const;
 
   // Returns the display with the specified display id, or null if there is no
   // display with that id.
   Display* GetDisplayById(int64_t display_id);
 
@@ skipping 50 matching lines @@
   // ID to use for next root node.
   ClientSpecificId next_root_id_;
 
   DISALLOW_COPY_AND_ASSIGN(DisplayManager);
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_DISPLAY_MANAGER_H_