Makes PhantonWindowController use ash/wm/common types

ash/wm/workspace/phantom_window_controller.h

Index: ash/wm/workspace/phantom_window_controller.h
diff --git a/ash/wm/workspace/phantom_window_controller.h b/ash/wm/workspace/phantom_window_controller.h
index 6bc320aab322ae2720e8d72effdf811d0c1abbfc..8e1983ba3a916dff7ba127cce5e1945437eec8c9 100644
--- a/ash/wm/workspace/phantom_window_controller.h
+++ b/ash/wm/workspace/phantom_window_controller.h
@@ -11,40 +11,37 @@
 #include "base/macros.h"
 #include "ui/gfx/geometry/rect.h"
 
-namespace aura {
-class Window;
-}
-
 namespace views {
 class Widget;
 }
 
 namespace ash {
+namespace wm {
+class WmWindow;
+}
 
 // PhantomWindowController is responsible for showing a phantom representation
 // of a window. It's used to show a preview of how snapping or docking a window
 // will affect the window's bounds.
 class ASH_EXPORT PhantomWindowController {
  public:
-  explicit PhantomWindowController(aura::Window* window);
+  explicit PhantomWindowController(wm::WmWindow* window);
 
   // Hides the phantom window without any animation.
-  virtual ~PhantomWindowController();
+  ~PhantomWindowController();
 
   // Shows the phantom window and animates shrinking it to |bounds_in_screen|.
   void Show(const gfx::Rect& bounds_in_screen);
 
  private:
-  friend class PhantomWindowControllerTest;
-
   // Creates, shows and returns a phantom widget at |bounds|
   // with kShellWindowId_ShelfContainer in |root_window| as a parent.
   std::unique_ptr<views::Widget> CreatePhantomWidget(
-      aura::Window* root_window,
+      wm::WmWindow* root_window,
       const gfx::Rect& bounds_in_screen);
 
   // Window that the phantom window is stacked above.
-  aura::Window* window_;
+  wm::WmWindow* window_;
 
   // Target bounds (including the shadows if any) of the animation in screen
   // coordinates.