Revert "Require V8 to be explicitly initialized before an Isolate is created"

src/snapshot-common.cc

 // Copyright 2006-2008 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.
 
 // The common functionality when building with or without snapshots.
 
 #include "src/v8.h"
 
 #include "src/api.h"
 #include "src/base/platform/platform.h"
 #include "src/serialize.h"
 #include "src/snapshot.h"
 
 namespace v8 {
 namespace internal {
 
 void Snapshot::ReserveSpaceForLinkedInSnapshot(Deserializer* deserializer) {
   deserializer->set_reservation(NEW_SPACE, new_space_used_);
   deserializer->set_reservation(OLD_POINTER_SPACE, pointer_space_used_);
   deserializer->set_reservation(OLD_DATA_SPACE, data_space_used_);
   deserializer->set_reservation(CODE_SPACE, code_space_used_);
   deserializer->set_reservation(MAP_SPACE, map_space_used_);
   deserializer->set_reservation(CELL_SPACE, cell_space_used_);
   deserializer->set_reservation(PROPERTY_CELL_SPACE,
                                 property_cell_space_used_);
 }
 
 
-bool Snapshot::Initialize(Isolate* isolate) {
+bool Snapshot::Initialize() {
   if (size_ > 0) {
     base::ElapsedTimer timer;
     if (FLAG_profile_deserialization) {
       timer.Start();
     }
     SnapshotByteSource source(raw_data_, raw_size_);
     Deserializer deserializer(&source);
     ReserveSpaceForLinkedInSnapshot(&deserializer);
-    bool success = isolate->Init(&deserializer);
+    bool success = V8::Initialize(&deserializer);
     if (FLAG_profile_deserialization) {
       double ms = timer.Elapsed().InMillisecondsF();
       PrintF("[Snapshot loading and deserialization took %0.3f ms]\n", ms);
     }
     return success;
   }
   return false;
 }
 
 
@@ skipping 28 matching lines @@
 // 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
 
 } }  // namespace v8::internal