Fix scoping of v8::HandleScope to prevent use-after-dispose

R=jkummerow@chromium.org
TEST=shell_g doesn't crash

Review URL: https://chromiumcodereview.appspot.com/9959014

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11195 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

samples/shell.cc

-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -67,6 +67,8 @@ static bool run_shell;
 int main(int argc, char* argv[]) {
   v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
   run_shell = (argc == 1);
+  int result;
+  {
     v8::HandleScope handle_scope;
     v8::Persistent<v8::Context> context = CreateShellContext();
     if (context.IsEmpty()) {
@@ -74,10 +76,11 @@ int main(int argc, char* argv[]) {
       return 1;
     }
     context->Enter();
-  int result = RunMain(argc, argv);
+    result = RunMain(argc, argv);
     if (run_shell) RunShell(context);
     context->Exit();
     context.Dispose();
+  }
   v8::V8::Dispose();
   return result;
 }