Remove legacy restart code

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/become.h"
@@ skipping 15389 matching lines @@
   ASSERT(Object::unwind_error_class() != Class::null());
   UnwindError& result = UnwindError::Handle();
   {
     RawObject* raw = Object::Allocate(UnwindError::kClassId,
                                       UnwindError::InstanceSize(), space);
     NoSafepointScope no_safepoint;
     result ^= raw;
   }
   result.set_message(message);
   result.set_is_user_initiated(false);
-  result.set_is_vm_restart(false);
   return result.raw();
 }
 
 
 void UnwindError::set_message(const String& message) const {
   StorePointer(&raw_ptr()->message_, message.raw());
 }
 
 
 void UnwindError::set_is_user_initiated(bool value) const {
   StoreNonPointer(&raw_ptr()->is_user_initiated_, value);
 }
 
 
-void UnwindError::set_is_vm_restart(bool value) const {
-  StoreNonPointer(&raw_ptr()->is_vm_restart_, value);
-}
-
-
 const char* UnwindError::ToErrorCString() const {
   const String& msg_str = String::Handle(message());
   return msg_str.ToCString();
 }
 
 
 const char* UnwindError::ToCString() const {
   return "UnwindError";
 }
 
@@ skipping 7617 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart