Remove unused ash::SHELF_ALIGNMENT_TOP

ash/wm/panels/panel_window_resizer.cc

Index: ash/wm/panels/panel_window_resizer.cc
diff --git a/ash/wm/panels/panel_window_resizer.cc b/ash/wm/panels/panel_window_resizer.cc
index 7d94aa5453d9731beeb6af5ad29b1076f01ab040..501503ad7b52905b1680b95a1d6963e0c19805ca 100644
--- a/ash/wm/panels/panel_window_resizer.cc
+++ b/ash/wm/panels/panel_window_resizer.cc
@@ -160,13 +160,6 @@ bool PanelWindowResizer::AttachToLauncher(const gfx::Rect& bounds,
           offset->set_x(launcher_bounds.x() - bounds.width() - bounds.x());
         }
         break;
-      case SHELF_ALIGNMENT_TOP:
-        if (bounds.y() <= (launcher_bounds.bottom() +
-                           kPanelSnapToLauncherDistance)) {
-          should_attach = true;
-          offset->set_y(launcher_bounds.bottom() - bounds.y());
-        }
-        break;
     }
   }
   return should_attach;