Remove SetModel in ContentsView and SearchBoxView.

ui/app_list/views/search_box_view.h

Index: ui/app_list/views/search_box_view.h
diff --git a/ui/app_list/views/search_box_view.h b/ui/app_list/views/search_box_view.h
index 69b30b444cae1fb24593e66f0750c4bdbc799655..439a4cf291b2cbd0eb4b999f4f5d4584b582ee39 100644
--- a/ui/app_list/views/search_box_view.h
+++ b/ui/app_list/views/search_box_view.h
@@ -22,6 +22,7 @@ namespace app_list {
 
 class AppListMenuViews;
 class AppListViewDelegate;
+class AppListModel;
 class SearchBoxModel;
 class SearchBoxViewDelegate;
 
@@ -35,11 +36,10 @@ class SearchBoxView : public views::View,
                       public SearchBoxModelObserver {
  public:
   SearchBoxView(SearchBoxViewDelegate* delegate,
-                AppListViewDelegate* view_delegate);
+                AppListViewDelegate* view_delegate,
+                AppListModel* model);
   virtual ~SearchBoxView();
 
-  void SetModel(SearchBoxModel* model);
-
   bool HasSearch() const;
   void ClearSearch();
   void InvalidateMenu();