Remove legacy restart code

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_OBJECT_H_
 #define RUNTIME_VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 5403 matching lines @@
   friend class Class;
   friend class ObjectStore;
 };
 
 
 class UnwindError : public Error {
  public:
   bool is_user_initiated() const { return raw_ptr()->is_user_initiated_; }
   void set_is_user_initiated(bool value) const;
 
-  bool is_vm_restart() const { return raw_ptr()->is_vm_restart_; }
-  void set_is_vm_restart(bool value) const;
-
   RawString* message() const { return raw_ptr()->message_; }
 
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawUnwindError));
   }
 
   static RawUnwindError* New(const String& message,
                              Heap::Space space = Heap::kNew);
 
   virtual const char* ToErrorCString() const;
@@ skipping 3495 matching lines @@
 
 inline void TypeArguments::SetHash(intptr_t value) const {
   // This is only safe because we create a new Smi, which does not cause
   // heap allocation.
   StoreSmi(&raw_ptr()->hash_, Smi::New(value));
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_OBJECT_H_