Convert "return local_var.Pass();" to "return local_var;".

mojo/public/cpp/bindings/map.h

Index: mojo/public/cpp/bindings/map.h
diff --git a/mojo/public/cpp/bindings/map.h b/mojo/public/cpp/bindings/map.h
index 22164c7240602290ef73f2b414c4f2f2680f7181..6702cabe485b1aab18378e125c3f958fc165c79c 100644
--- a/mojo/public/cpp/bindings/map.h
+++ b/mojo/public/cpp/bindings/map.h
@@ -136,7 +136,7 @@ class Map {
     Map result;
     result.is_null_ = is_null_;
     Traits::Clone(map_, &result.map_);
-    return result.Pass();
+    return result;
   }
 
   // Indicates whether the contents of this map are equal to those of another
@@ -274,7 +274,7 @@ struct TypeConverter<Map<MojoKey, MojoValue>, std::map<STLKey, STLValue>> {
       result.insert(TypeConverter<MojoKey, STLKey>::Convert(pair.first),
                     TypeConverter<MojoValue, STLValue>::Convert(pair.second));
     }
-    return result.Pass();
+    return result;
   }
 };