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

src/snapshot-empty.cc

Index: src/snapshot-empty.cc
diff --git a/src/snapshot-empty.cc b/src/snapshot-empty.cc
index 020d1cb8125a64036137531484b31afff8c2bfb2..749c5874aa22e4fef7a28748d531c3613cd886af 100644
--- a/src/snapshot-empty.cc
+++ b/src/snapshot-empty.cc
@@ -11,18 +11,9 @@
 namespace v8 {
 namespace internal {
 
-#ifdef V8_USE_EXTERNAL_STARTUP_DATA
-// Dummy implementations of Set*FromFile(..) APIs.
-//
-// These are meant for use with snapshot-external.cc. Should this file
-// be compiled with those options we just supply these dummy implementations
-// below. This happens when compiling the mksnapshot utility.
-void SetNativesFromFile(StartupData* data) { CHECK(false); }
-void SetSnapshotFromFile(StartupData* data) { CHECK(false); }
-#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+const byte Snapshot::data_[] = { 0 };
+const int Snapshot::size_ = 0;
+const byte Snapshot::context_data_[] = { 0 };
+const int Snapshot::context_size_ = 0;
 
-
-const v8::StartupData Snapshot::SnapshotBlob() {
-  return {NULL, 0};
-}
 } }  // namespace v8::internal