Fix local handle leak in RegExpStringModificationTest.

test/cctest/test-api.cc

 // Copyright 2007-2009 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:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 9185 matching lines @@
     }
     morph_success_ = true;
   }
 
   void LongRunningRegExp() {
     block_->Signal();  // Enable morphing thread on next preemption.
     while (morphs_during_regexp_ < kRequiredModifications &&
            morphs_ < kMaxModifications) {
       int morphs_before = morphs_;
       {
+        v8::HandleScope scope;
         // Match 15-30 "a"'s against 14 and a "b".
         const char* c_source =
             "/a?a?a?a?a?a?a?a?a?a?a?a?a?a?aaaaaaaaaaaaaaaa/"
             ".exec(input) === null";
         Local<String> source = String::New(c_source);
         Local<Script> script = Script::Compile(source);
         Local<Value> result = script->Run();
         CHECK(result->IsTrue());
       }
       int morphs_after = morphs_;
@@ skipping 2061 matching lines @@
   ExpectFalse("Object.prototype.hasOwnProperty.call(other, \'0\')");
 
   CHECK_EQ(false, global0->HasRealIndexedProperty(0));
   CHECK_EQ(false, global0->HasRealNamedProperty(v8_str("x")));
   CHECK_EQ(false, global0->HasRealNamedCallbackProperty(v8_str("x")));
 
   // Reset the failed access check callback so it does not influence
   // the other tests.
   v8::V8::SetFailedAccessCheckCallbackFunction(NULL);
 }