mash: Convert ash shelf overflow bubble to wm common types

ash/common/shelf/ink_drop_button_listener.h

Index: ash/common/shelf/ink_drop_button_listener.h
diff --git a/ash/shelf/ink_drop_button_listener.h b/ash/common/shelf/ink_drop_button_listener.h
similarity index 84%
rename from ash/shelf/ink_drop_button_listener.h
rename to ash/common/shelf/ink_drop_button_listener.h
index 6374c3e565aea04bdaaee4ec87bb1f1437d76314..4b6e7522453bfbccac66c24ccd35448a3970b30a 100644
--- a/ash/shelf/ink_drop_button_listener.h
+++ b/ash/common/shelf/ink_drop_button_listener.h
@@ -2,11 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SHELF_INK_DROP_BUTTON_LISTENER_H_
-#define ASH_SHELF_INK_DROP_BUTTON_LISTENER_H_
+#ifndef ASH_COMMON_SHELF_INK_DROP_BUTTON_LISTENER_H_
+#define ASH_COMMON_SHELF_INK_DROP_BUTTON_LISTENER_H_
 
 #include "ash/ash_export.h"
 
+namespace ui {
+class Event;
+}
+
 namespace views {
 class Button;
 class InkDrop;
@@ -34,4 +38,4 @@ class ASH_EXPORT InkDropButtonListener {
 
 }  // namespace ash
 
-#endif  // ASH_SHELF_INK_DROP_BUTTON_LISTENER_H_
+#endif  // ASH_COMMON_SHELF_INK_DROP_BUTTON_LISTENER_H_