[snapshot] pass arguments as pointers, not references.

src/snapshot/snapshot.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_SNAPSHOT_SNAPSHOT_H_
 #define V8_SNAPSHOT_SNAPSHOT_H_
 
 #include "src/snapshot/partial-serializer.h"
 #include "src/snapshot/startup-serializer.h"
 
@@ skipping 18 matching lines @@
 
   static bool EmbedsScript(Isolate* isolate);
 
   static uint32_t SizeOfFirstPage(Isolate* isolate, AllocationSpace space);
 
 
   // To be implemented by the snapshot source.
   static const v8::StartupData* DefaultSnapshotBlob();
 
   static v8::StartupData CreateSnapshotBlob(
-      const StartupSerializer& startup_ser,
-      const PartialSerializer& context_ser);
+      const StartupSerializer* startup_serializer,
+      const PartialSerializer* context_serializer);
 
 #ifdef DEBUG
   static bool SnapshotIsValid(v8::StartupData* snapshot_blob);
 #endif  // DEBUG
 
  private:
   static Vector<const byte> ExtractStartupData(const v8::StartupData* data);
   static Vector<const byte> ExtractContextData(const v8::StartupData* data);
 
   // Snapshot blob layout:
@@ skipping 17 matching lines @@
 };
 
 #ifdef V8_USE_EXTERNAL_STARTUP_DATA
 void SetSnapshotFromFile(StartupData* snapshot_blob);
 #endif
 
 // Wrapper around reservation sizes and the serialization payload.
 class SnapshotData : public SerializedData {
  public:
   // Used when producing.
-  explicit SnapshotData(const Serializer& ser);
+  explicit SnapshotData(const Serializer* serializer);
 
   // Used when consuming.
   explicit SnapshotData(const Vector<const byte> snapshot)
       : SerializedData(const_cast<byte*>(snapshot.begin()), snapshot.length()) {
     CHECK(IsSane());
   }
 
   Vector<const Reservation> Reservations() const;
   Vector<const byte> Payload() const;
 
@@ skipping 14 matching lines @@
   static const int kCheckSumOffset = kMagicNumberOffset + kInt32Size;
   static const int kNumReservationsOffset = kCheckSumOffset + kInt32Size;
   static const int kPayloadLengthOffset = kNumReservationsOffset + kInt32Size;
   static const int kHeaderSize = kPayloadLengthOffset + kInt32Size;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_SNAPSHOT_SNAPSHOT_H_