Convert String and List to abstract classes.

runtime/vm/snapshot.cc

Index: runtime/vm/snapshot.cc
diff --git a/runtime/vm/snapshot.cc b/runtime/vm/snapshot.cc
index b5102a313dd872452a5bee70f652cbea496abc02..ae08a2806f106595072c4ea5b3bf88546b90890f 100644
--- a/runtime/vm/snapshot.cc
+++ b/runtime/vm/snapshot.cc
@@ -66,8 +66,8 @@ static RawType* GetType(ObjectStore* object_store, int index) {
     case kDoubleType: return object_store->double_type();
     case kIntType: return object_store->int_type();
     case kBoolType: return object_store->bool_type();
-    case kStringInterface: return object_store->string_interface();
-    case kListInterface: return object_store->list_interface();
+    case kStringType: return object_store->string_type();
+    case kListType: return object_store->list_type();
     case kByteArrayInterface: return object_store->byte_array_interface();
     default: break;
   }
@@ -100,10 +100,10 @@ static int GetTypeIndex(ObjectStore* object_store, const RawType* raw_type) {
     return kIntType;
   } else if (raw_type == object_store->bool_type()) {
     return kBoolType;
-  } else if (raw_type == object_store->string_interface()) {
-    return kStringInterface;
-  } else if (raw_type == object_store->list_interface()) {
-    return kListInterface;
+  } else if (raw_type == object_store->string_type()) {
+    return kStringType;
+  } else if (raw_type == object_store->list_type()) {
+    return kListType;
   } else if (raw_type == object_store->byte_array_interface()) {
     return kByteArrayInterface;
   }