Revert of Use same blob format for internal and external snapshots.

src/serialize.h

 // Copyright 2012 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_SERIALIZE_H_
 #define V8_SERIALIZE_H_
 
 #include "src/compiler.h"
 #include "src/hashmap.h"
 #include "src/heap-profiler.h"
@@ skipping 847 matching lines @@
 };
 
 
 // Wrapper around reservation sizes and the serialization payload.
 class SnapshotData : public SerializedData {
  public:
   // Used when producing.
   SnapshotData(const SnapshotByteSink& sink, const Serializer& ser);
 
   // Used when consuming.
-  explicit SnapshotData(const Vector<const byte> snapshot)
-      : SerializedData(const_cast<byte*>(snapshot.begin()), snapshot.length()) {
+  explicit SnapshotData(const byte* data, int size)
+      : SerializedData(const_cast<byte*>(data), size) {
     CHECK(IsSane());
   }
 
   Vector<const Reservation> Reservations() const;
   Vector<const byte> Payload() const;
 
   Vector<const byte> RawData() const {
     return Vector<const byte>(data_, size_);
   }
 
@@ skipping 53 matching lines @@
   static const int kCheckSumOffset = 0;
   static const int kNumInternalizedStringsOffset = 1;
   static const int kReservationsOffset = 2;
   static const int kNumCodeStubKeysOffset = 3;
   static const int kPayloadLengthOffset = 4;
   static const int kHeaderSize = (kPayloadLengthOffset + 1) * kIntSize;
 };
 } }  // namespace v8::internal
 
 #endif  // V8_SERIALIZE_H_