ui: Cleanup the usage of scoped_ptr throughout.

ui/app_list/search/mixer_unittest.cc

Index: ui/app_list/search/mixer_unittest.cc
diff --git a/ui/app_list/search/mixer_unittest.cc b/ui/app_list/search/mixer_unittest.cc
index 78c233eec1ef9f367dff3062959064e9fd94dcee..7c56159dd1afa8d46a8aa454f8ef4832077c17fb 100644
--- a/ui/app_list/search/mixer_unittest.cc
+++ b/ui/app_list/search/mixer_unittest.cc
@@ -35,7 +35,7 @@ class TestSearchResult : public SearchResult {
   void Open(int event_flags) override {}
   void InvokeAction(int action_index, int event_flags) override {}
   scoped_ptr<SearchResult> Duplicate() const override {
-    return scoped_ptr<SearchResult>(new TestSearchResult(id(), relevance()));
+    return make_scoped_ptr(new TestSearchResult(id(), relevance()));
   }
 
   // For reference equality testing. (Addresses cannot be used to test reference