Move runtime helper for JSWeakCollection onto objects.

test/cctest/test-weaksets.cc

Index: test/cctest/test-weaksets.cc
diff --git a/test/cctest/test-weaksets.cc b/test/cctest/test-weaksets.cc
index 3595af288fb4ea3f722068724aa9cba0e367ec48..1abf1a69a71ed31e7a3771a1ff5e9bc3f88b220b 100644
--- a/test/cctest/test-weaksets.cc
+++ b/test/cctest/test-weaksets.cc
@@ -90,7 +90,7 @@ TEST(WeakSet_Weakness) {
     HandleScope scope(isolate);
     Handle<Smi> smi(Smi::FromInt(23), isolate);
     int32_t hash = Object::GetOrCreateHash(isolate, key)->value();
-    Runtime::WeakCollectionSet(weakset, key, smi, hash);
+    JSWeakCollection::Set(weakset, key, smi, hash);
   }
   CHECK_EQ(1, ObjectHashTable::cast(weakset->table())->NumberOfElements());
 
@@ -146,7 +146,7 @@ TEST(WeakSet_Shrinking) {
       Handle<JSObject> object = factory->NewJSObjectFromMap(map);
       Handle<Smi> smi(Smi::FromInt(i), isolate);
       int32_t hash = Object::GetOrCreateHash(isolate, object)->value();
-      Runtime::WeakCollectionSet(weakset, object, smi, hash);
+      JSWeakCollection::Set(weakset, object, smi, hash);
     }
   }
 
@@ -195,7 +195,7 @@ TEST(WeakSet_Regress2060a) {
       CHECK(!heap->InNewSpace(object->address()));
       CHECK(!first_page->Contains(object->address()));
       int32_t hash = Object::GetOrCreateHash(isolate, key)->value();
-      Runtime::WeakCollectionSet(weakset, key, object, hash);
+      JSWeakCollection::Set(weakset, key, object, hash);
     }
   }
 
@@ -238,7 +238,7 @@ TEST(WeakSet_Regress2060b) {
   for (int i = 0; i < 32; i++) {
     Handle<Smi> smi(Smi::FromInt(i), isolate);
     int32_t hash = Object::GetOrCreateHash(isolate, keys[i])->value();
-    Runtime::WeakCollectionSet(weakset, keys[i], smi, hash);
+    JSWeakCollection::Set(weakset, keys[i], smi, hash);
   }
 
   // Force compacting garbage collection. The subsequent collections are used