ash: Explicitly teach various components about ShelfLayoutManager.

ash/shelf/overflow_bubble_view.cc

Index: ash/shelf/overflow_bubble_view.cc
diff --git a/ash/shelf/overflow_bubble_view.cc b/ash/shelf/overflow_bubble_view.cc
index 5273e50684bdde0e6c1e5342a97d60b663a4927c..b15f7b73987d2f97e1a7f55984cb1031852db07f 100644
--- a/ash/shelf/overflow_bubble_view.cc
+++ b/ash/shelf/overflow_bubble_view.cc
@@ -41,8 +41,6 @@ OverflowBubbleView::~OverflowBubbleView() {
 
 void OverflowBubbleView::InitOverflowBubble(views::View* anchor,
                                             ShelfView* shelf_view) {
-  // set_anchor_view needs to be called before GetShelfLayoutManager() can be
-  // called.
   SetAnchorView(anchor);
   set_arrow(GetBubbleArrow());
   set_background(NULL);
@@ -108,6 +106,10 @@ void OverflowBubbleView::ScrollByYOffset(int y_offset) {
   scroll_offset_.set_y(y);
 }
 
+ShelfLayoutManager* OverflowBubbleView::GetShelfLayoutManager() const {
+  return shelf_view_ ? shelf_view_->shelf_layout_manager() : nullptr;
+}
+
 gfx::Size OverflowBubbleView::GetPreferredSize() const {
   gfx::Size preferred_size = GetContentsSize();
 
@@ -164,12 +166,6 @@ bool OverflowBubbleView::OnMouseWheel(const ui::MouseWheelEvent& event) {
   return true;
 }
 
-ShelfLayoutManager* OverflowBubbleView::GetShelfLayoutManager() const {
-  return GetAnchorView() ? ShelfLayoutManager::ForShelf(
-                               GetAnchorView()->GetWidget()->GetNativeView())
-                         : NULL;
-}
-
 void OverflowBubbleView::OnScrollEvent(ui::ScrollEvent* event) {
   ScrollByXOffset(-event->x_offset());
   ScrollByYOffset(-event->y_offset());