Fix compilation error.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 4e0416dd12348a7f056099d3cb8e57a36c478f3e..4d70b32147318bdd8f27add24dac5245c1dd8230 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -11227,7 +11227,7 @@ template<typename Shape, typename Key>
 void Dictionary<Shape, Key>::CopyKeysTo(
     FixedArray* storage,
     PropertyAttributes filter,
-    Dictionary<Shape, Key>::SortMode sort_mode) {
+    typename Dictionary<Shape, Key>::SortMode sort_mode) {
   ASSERT(storage->length() >= NumberOfEnumElements());
   int capacity = HashTable<Shape, Key>::Capacity();
   int index = 0;
@@ -11270,7 +11270,7 @@ void StringDictionary::CopyEnumKeysTo(FixedArray* storage,
 template<typename Shape, typename Key>
 void Dictionary<Shape, Key>::CopyKeysTo(
     FixedArray* storage,
-    Dictionary<Shape, Key>::SortMode sort_mode) {
+    typename Dictionary<Shape, Key>::SortMode sort_mode) {
   ASSERT(storage->length() >= NumberOfElementsFilterAttributes(
       static_cast<PropertyAttributes>(NONE)));
   int capacity = HashTable<Shape, Key>::Capacity();