Use same blob format for internal and external snapshots.

src/natives-external.cc

Index: src/natives-external.cc
diff --git a/src/natives-external.cc b/src/natives-external.cc
index cfa00bc1345a1cb746d8946ceeb272cf7d444eeb..43120912879525cba365e8196b9fbb18fea9cadb 100644
--- a/src/natives-external.cc
+++ b/src/natives-external.cc
@@ -10,6 +10,11 @@
 #include "src/snapshot-source-sink.h"
 #include "src/vector.h"
 
+#ifndef V8_USE_EXTERNAL_STARTUP_DATA
+#error natives-external.cc is used only for the external snapshot build.
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+
+
 namespace v8 {
 namespace internal {
 
@@ -142,8 +147,7 @@ void SetNativesFromFile(StartupData* natives_blob) {
   DCHECK(natives_blob->data);
   DCHECK(natives_blob->raw_size > 0);
 
-  SnapshotByteSource bytes(reinterpret_cast<const byte*>(natives_blob->data),
-                           natives_blob->raw_size);
+  SnapshotByteSource bytes(natives_blob->data, natives_blob->raw_size);
   NativesHolder<CORE>::set(NativesStore::MakeFromScriptsSource(&bytes));
   NativesHolder<EXPERIMENTAL>::set(NativesStore::MakeFromScriptsSource(&bytes));
   DCHECK(!bytes.HasMore());
@@ -188,7 +192,7 @@ Vector<const char> NativesCollection<type>::GetScriptsSource() {
 
 
 // The compiler can't 'see' all uses of the static methods and hence
-// my chose to elide them. This we'll explicitly instantiate these.
+// my choice to elide them. This we'll explicitly instantiate these.
 template class NativesCollection<CORE>;
 template class NativesCollection<EXPERIMENTAL>;