Pushed InkDropHost inheritence up to CustomButton.

ui/views/animation/ink_drop_host.h

Index: ui/views/animation/ink_drop_host.h
diff --git a/ui/views/animation/ink_drop_host.h b/ui/views/animation/ink_drop_host.h
index 0830a41294ac3ab39632a5bb1b0311437ca90baa..64aa0cf7f22cc3b33d0b6453dbf5a3d37bbb4616 100644
--- a/ui/views/animation/ink_drop_host.h
+++ b/ui/views/animation/ink_drop_host.h
@@ -24,14 +24,14 @@ namespace views {
 // a lightweight Layer that can parent the ink drop layer.
 class VIEWS_EXPORT InkDropHost {
  public:
-  InkDropHost() {}
-  virtual ~InkDropHost() {}
+  InkDropHost();
+  virtual ~InkDropHost();
 
-  // Add the |ink_drop_layer| in to a visible layer tree.
-  virtual void AddInkDropLayer(ui::Layer* ink_drop_layer) = 0;
+  // Adds the |ink_drop_layer| in to a visible layer tree.
+  virtual void AddInkDropLayer(ui::Layer* ink_drop_layer);
 
   // Removes |ink_drop_layer| from the layer tree.
-  virtual void RemoveInkDropLayer(ui::Layer* ink_drop_layer) = 0;
+  virtual void RemoveInkDropLayer(ui::Layer* ink_drop_layer);
 
   // Returns the Point where the ink drop should be centered.
   // TODO(varkha): This should be moved to InkDropConsumer.