Remove TransparentActivateWindowButton from Overview Mode

ash/wm/overview/scoped_transform_overview_window.h

Index: ash/wm/overview/scoped_transform_overview_window.h
diff --git a/ash/wm/overview/scoped_transform_overview_window.h b/ash/wm/overview/scoped_transform_overview_window.h
index 99ad65896d59e6b31429f7cc601e7cc2536bb0bc..8a2dec7f445d2812cd82cf46cfa9b8a52dda9733 100644
--- a/ash/wm/overview/scoped_transform_overview_window.h
+++ b/ash/wm/overview/scoped_transform_overview_window.h
@@ -6,8 +6,6 @@
 #define ASH_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_
 
 #include "ash/wm/overview/scoped_overview_animation_settings.h"
-#include "ash/wm/overview/transparent_activate_window_button.h"
-#include "ash/wm/overview/transparent_activate_window_button_delegate.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
@@ -35,8 +33,7 @@ class ScopedWindowCopy;
 // class allows transforming the windows with a helper to determine the best
 // fit in certain bounds. The window's state is restored on destruction of this
 // object.
-class ScopedTransformOverviewWindow
-    : public TransparentActivateWindowButtonDelegate {
+class ScopedTransformOverviewWindow {
  public:
   typedef ScopedVector<ScopedOverviewAnimationSettings> ScopedAnimationSettings;
 
@@ -51,7 +48,7 @@ class ScopedTransformOverviewWindow
                                             const gfx::Rect& dst_rect);
 
   explicit ScopedTransformOverviewWindow(aura::Window* window);
-  ~ScopedTransformOverviewWindow() override;
+  ~ScopedTransformOverviewWindow();
 
   gfx::Transform get_overview_transform() const { return overview_transform_; }
 
@@ -59,10 +56,6 @@ class ScopedTransformOverviewWindow
     overview_transform_ = transform;
   }
 
-  TransparentActivateWindowButton* activate_button() {
-    return activate_button_.get();
-  }
-
   // Starts an animation sequence which will use animation settings specified by
   // |animation_type|. The |animation_settings| container is populated with
   // scoped entities and the container should be destroyed at the end of the
@@ -115,9 +108,6 @@ class ScopedTransformOverviewWindow
   // Closes the transient root of the window managed by |this|.
   void Close();
 
-  // ash::TransparentActivateWindowButtonDelegate:
-  void Select() override;
-
  private:
   // Shows the window if it was minimized.
   void ShowWindowIfMinimized();
@@ -125,9 +115,6 @@ class ScopedTransformOverviewWindow
   // A weak pointer to the real window in the overview.
   aura::Window* window_;
 
-  // The transparent overlay that captures events.
-  scoped_ptr<TransparentActivateWindowButton> activate_button_;
-
   // If true, the window was minimized and should be restored if the window
   // was not selected.
   bool minimized_;