Refactor screen/monitor so that gfx::Screen returns monitor object.

ui/aura/test/single_monitor_manager.h

Index: ui/aura/test/single_monitor_manager.h
diff --git a/ui/aura/test/single_monitor_manager.h b/ui/aura/test/single_monitor_manager.h
index 58b65ef0c8b5be544730c228b4c075cc062b33f4..926bee2339e87a43c5210932b8b37bca12e488bb 100644
--- a/ui/aura/test/single_monitor_manager.h
+++ b/ui/aura/test/single_monitor_manager.h
@@ -16,6 +16,8 @@ class Rect;
 }
 
 namespace aura {
+class MonitorAura;
+
 namespace test {
 
 // A monitor manager assuming there is one monitor.
@@ -27,16 +29,18 @@ class SingleMonitorManager : public MonitorManager,
 
   // MonitorManager overrides:
   virtual void OnNativeMonitorsChanged(
-      const std::vector<const Monitor*>& monitors) OVERRIDE;
+      const std::vector<const MonitorAura*>& monitors) OVERRIDE;
   virtual RootWindow* CreateRootWindowForMonitor(
-      Monitor* monitor) OVERRIDE;
-  virtual const Monitor* GetMonitorNearestWindow(
+      MonitorAura* monitor) OVERRIDE;
+  virtual MonitorAura* GetMonitorAt(size_t index) OVERRIDE;
+
+  virtual size_t GetNumMonitors() const OVERRIDE;
+
+  virtual const MonitorAura* GetMonitorNearestWindow(
       const Window* window) const OVERRIDE;
-  virtual const Monitor* GetMonitorNearestPoint(
+  virtual MonitorAura* GetMonitorNearestWindow(const Window* window) OVERRIDE;
+  virtual const MonitorAura* GetMonitorNearestPoint(
       const gfx::Point& point) const OVERRIDE;
-  virtual Monitor* GetMonitorAt(size_t index) OVERRIDE;
-  virtual size_t GetNumMonitors() const OVERRIDE;
-  virtual Monitor* GetMonitorNearestWindow(const Window* window) OVERRIDE;
 
   // WindowObserver overrides:
   virtual void OnWindowBoundsChanged(Window* window,
@@ -48,7 +52,7 @@ class SingleMonitorManager : public MonitorManager,
   void Update(const gfx::Size size);
 
   RootWindow* root_window_;
-  scoped_ptr<Monitor> monitor_;
+  scoped_ptr<MonitorAura> monitor_;
 
   DISALLOW_COPY_AND_ASSIGN(SingleMonitorManager);
 };