Remove TransparentActivateWindowButton from Overview Mode

ash/wm/overview/window_selector_item.h

Index: ash/wm/overview/window_selector_item.h
diff --git a/ash/wm/overview/window_selector_item.h b/ash/wm/overview/window_selector_item.h
index 584d2758929ac36442240948171031f7bb494e0e..2597580cecaf0cbef7f7f719f646ce960c1ccbb8 100644
--- a/ash/wm/overview/window_selector_item.h
+++ b/ash/wm/overview/window_selector_item.h
@@ -7,8 +7,6 @@
 
 #include "ash/ash_export.h"
 #include "ash/wm/overview/scoped_transform_overview_window.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 "ui/aura/window_observer.h"
@@ -21,7 +19,7 @@ class Window;
 }
 
 namespace views {
-class Label;
+class LabelButton;
 class Widget;
 }
 
@@ -32,8 +30,7 @@ namespace ash {
 // any can be selected with a pointer (touch or mouse).
 class ASH_EXPORT WindowSelectorItem
     : public views::ButtonListener,
-      public aura::WindowObserver,
-      public TransparentActivateWindowButtonDelegate {
+      public aura::WindowObserver {
  public:
   explicit WindowSelectorItem(aura::Window* root_window);
   ~WindowSelectorItem() override;
@@ -101,9 +98,6 @@ class ASH_EXPORT WindowSelectorItem
   // aura::WindowObserver:
   void OnWindowTitleChanged(aura::Window* window) override;
 
-  // ash::TransparentActivateWindowButtonDelegate:
-  void Select() override;
-
  private:
   friend class WindowSelectorTest;
 
@@ -161,7 +155,7 @@ class ASH_EXPORT WindowSelectorItem
   scoped_ptr<views::Widget> window_label_;
 
   // View for the label under the window.
-  views::Label* window_label_view_;
+  views::LabelButton* window_label_button_view_;
 
   // The close buttons widget container.
   views::Widget close_button_widget_;
@@ -170,12 +164,6 @@ class ASH_EXPORT WindowSelectorItem
   // close_button_widget_.
   views::ImageButton* close_button_;
 
-  // Transparent overlay that covers the entire bounds of the
-  // WindowSelectorItem and is stacked in front of all windows but behind each
-  // Windows' own TransparentActivateWindowButton.
-  scoped_ptr<TransparentActivateWindowButton>
-      selector_item_activate_window_button_;
-
   // List of all Windows added to this and their associated helper classes.
   TransformWindows transform_windows_;