[d8] cleanly force exit in d8 on windows.

src/d8.cc

 // Copyright 2012 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.
 
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
 
 #include <algorithm>
@@ skipping 1551 matching lines @@
       factory->NewJSArrayWithElements(arguments_array);
   context->Global()
       ->Set(context,
             String::NewFromUtf8(isolate, "arguments", NewStringType::kNormal)
                 .ToLocalChecked(),
             Utils::ToLocal(arguments_jsarray))
       .FromJust();
   return handle_scope.Escape(context);
 }
 
-
-void Shell::Exit(int exit_code) {
-  // Use _exit instead of exit to avoid races between isolate
-  // threads and static destructors.
-  fflush(stdout);
-  fflush(stderr);
-  _exit(exit_code);
-}
-
-
 struct CounterAndKey {
   Counter* counter;
   const char* key;
 };
 
 
 inline bool operator<(const CounterAndKey& lhs, const CounterAndKey& rhs) {
   return strcmp(lhs.key, rhs.key) < 0;
 }
 
@@ skipping 1364 matching lines @@
 }
 
 }  // namespace v8
 
 
 #ifndef GOOGLE3
 int main(int argc, char* argv[]) {
   return v8::Shell::Main(argc, argv);
 }
 #endif