app_list::SearchResult: Duplicate() is const.

ash/shell/app_list.cc

Index: ash/shell/app_list.cc
diff --git a/ash/shell/app_list.cc b/ash/shell/app_list.cc
index 297baa87d6828b6a33d6a94b630a4fc876b17077..ec2071fe5293a17ccd3a6a3e91be6964767e8e2b 100644
--- a/ash/shell/app_list.cc
+++ b/ash/shell/app_list.cc
@@ -192,7 +192,7 @@ class ExampleSearchResult : public app_list::SearchResult {
   WindowTypeShelfItem::Type type() const { return type_; }
 
   // app_list::SearchResult:
-  scoped_ptr<SearchResult> Duplicate() override {
+  scoped_ptr<SearchResult> Duplicate() const override {
     return scoped_ptr<SearchResult>();
   }