ash: Remove unnecessary WmShelf::SchedulePaint() method

ash/common/shelf/wm_shelf.cc

Index: ash/common/shelf/wm_shelf.cc
diff --git a/ash/common/shelf/wm_shelf.cc b/ash/common/shelf/wm_shelf.cc
index 946dafaf5504467de6fac873f89afe743d1fb80e..2dd361f09555a5c15753713bcd9ed1164a1860e5 100644
--- a/ash/common/shelf/wm_shelf.cc
+++ b/ash/common/shelf/wm_shelf.cc
@@ -105,12 +105,6 @@ bool WmShelf::IsDimmed() const {
   return shelf_layout_manager_->shelf_widget()->GetDimsShelf();
 }
 
-void WmShelf::SchedulePaint() {
-  // Can be called during shutdown if the overflow bubble is visible.
-  if (shelf_)
-    shelf_->SchedulePaint();
-}
-
 bool WmShelf::IsVisible() const {
   return shelf_->IsVisible();
 }