WeakHashTable::Lookup() handlified and ObjectHashTable's interface cleaned up.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 0c1cc570cadc66810ec121efb7f29b0f63700c9b..3ef878eba4d57a5307d8972c0e29b8b45c234056 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -5514,11 +5514,11 @@ void Heap::AddWeakObjectToCodeDependency(Handle<Object> obj,
     WeakHashTable::cast(weak_object_to_code_table_)->Zap(the_hole_value());
   }
   set_weak_object_to_code_table(*table);
-  ASSERT_EQ(*dep, table->Lookup(*obj));
+  ASSERT_EQ(*dep, table->Lookup(obj));
 }
 
 
-DependentCode* Heap::LookupWeakObjectToCodeDependency(Object* obj) {
+DependentCode* Heap::LookupWeakObjectToCodeDependency(Handle<Object> obj) {
   Object* dep = WeakHashTable::cast(weak_object_to_code_table_)->Lookup(obj);
   if (dep->IsDependentCode()) return DependentCode::cast(dep);
   return DependentCode::cast(empty_fixed_array());