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