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

src/snapshot.h

Index: src/snapshot.h
diff --git a/src/snapshot.h b/src/snapshot.h
index d37b50aebe02f44e363eb5f22efd16d846ebb6d3..384e655c5693caed379cf738682919f9884e1db7 100644
--- a/src/snapshot.h
+++ b/src/snapshot.h
@@ -15,16 +15,18 @@
   // Initialize the Isolate from the internal snapshot. Returns false if no
   // snapshot could be found.
   static bool Initialize(Isolate* isolate);
+
+  static bool HaveASnapshotToStartFrom();
+
   // Create a new context using the internal partial snapshot.
   static Handle<Context> NewContextFromSnapshot(Isolate* isolate);
 
-  static const Vector<const byte> StartupSnapshot();
-  static const Vector<const byte> ContextSnapshot();
-  static bool HaveASnapshotToStartFrom();
+ private:
+  static const byte data_[];
+  static const int size_;
+  static const byte context_data_[];
+  static const int context_size_;
 
-  static const v8::StartupData SnapshotBlob();
-
- private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Snapshot);
 };