Converts ShellObserver from aura::Window to ash::WmWindow

ash/shell_observer.h

Index: ash/shell_observer.h
diff --git a/ash/shell_observer.h b/ash/shell_observer.h
index e4d23a19512e71cb8201e55aa76eb09615cf409c..7356e3e9fa6ff32a8ed5b6e52d90a0fa9c3e37c6 100644
--- a/ash/shell_observer.h
+++ b/ash/shell_observer.h
@@ -8,12 +8,10 @@
 #include "ash/ash_export.h"
 #include "ash/system/user/login_status.h"
 
-namespace aura {
-class Window;
-}
-
 namespace ash {
 
+class WmWindow;
+
 class ASH_EXPORT ShellObserver {
  public:
   // Invoked after the screen's work area insets changes.
@@ -33,23 +31,23 @@ class ASH_EXPORT ShellObserver {
   virtual void OnCastingSessionStartedOrStopped(bool started) {}
 
   // Invoked after a non-primary root window is created.
-  virtual void OnRootWindowAdded(aura::Window* root_window) {}
+  virtual void OnRootWindowAdded(WmWindow* root_window) {}
 
   // Invoked after the shelf has been created for |root_window|.
-  virtual void OnShelfCreatedForRootWindow(aura::Window* root_window) {}
+  virtual void OnShelfCreatedForRootWindow(WmWindow* root_window) {}
 
   // Invoked when the shelf alignment in |root_window| is changed.
-  virtual void OnShelfAlignmentChanged(aura::Window* root_window) {}
+  virtual void OnShelfAlignmentChanged(WmWindow* root_window) {}
 
   // Invoked when the shelf auto-hide behavior in |root_window| is changed.
-  virtual void OnShelfAutoHideBehaviorChanged(aura::Window* root_window) {}
+  virtual void OnShelfAutoHideBehaviorChanged(WmWindow* root_window) {}
 
   // Invoked when the projection touch HUD is toggled.
   virtual void OnTouchHudProjectionToggled(bool enabled) {}
 
   // Invoked when entering or exiting fullscreen mode in |root_window|.
   virtual void OnFullscreenStateChanged(bool is_fullscreen,
-                                        aura::Window* root_window) {}
+                                        WmWindow* root_window) {}
 
   // Called when the overview mode is about to be started (before the windows
   // get re-arranged).