Protect SerializedData from copying.

src/snapshot/code-serializer.h

Index: src/snapshot/code-serializer.h
diff --git a/src/snapshot/code-serializer.h b/src/snapshot/code-serializer.h
index 52e4daaf9945fb476eb550f897a35a62e5bb880b..38112cd9261de57aa76fe9cd6fa252af67c2f567 100644
--- a/src/snapshot/code-serializer.h
+++ b/src/snapshot/code-serializer.h
@@ -116,9 +116,10 @@ class SerializedCodeData : public SerializedData {
   static const int kHeaderSize = POINTER_SIZE_ALIGN(kUnalignedHeaderSize);
 
   // Used when consuming.
-  static const SerializedCodeData FromCachedData(
-      Isolate* isolate, ScriptData* cached_data, uint32_t expected_source_hash,
-      SanityCheckResult* rejection_result);
+  static SerializedCodeData FromCachedData(Isolate* isolate,
+                                           ScriptData* cached_data,
+                                           uint32_t expected_source_hash,
+                                           SanityCheckResult* rejection_result);
 
   // Used when producing.
   SerializedCodeData(const List<byte>* payload, const CodeSerializer* cs);