Fix mem leaks in tests.

test/cctest/test-api.cc

 // 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:
 //
 //     * 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 22413 matching lines @@
 static int last_event_status;
 void StoringEventLoggerCallback(const char* message, int status) {
     last_event_message = message;
     last_event_status = status;
 }
 
 
 TEST(EventLogging) {
   v8::Isolate* isolate = CcTest::isolate();
   isolate->SetEventLogger(StoringEventLoggerCallback);
-  v8::internal::HistogramTimer* histogramTimer =
-      new v8::internal::HistogramTimer(
-          "V8.Test", 0, 10000, 50,
-          reinterpret_cast<v8::internal::Isolate*>(isolate));
-  histogramTimer->Start();
+  v8::internal::HistogramTimer histogramTimer(
+      "V8.Test", 0, 10000, 50,
+      reinterpret_cast<v8::internal::Isolate*>(isolate));
+  histogramTimer.Start();
   CHECK_EQ("V8.Test", last_event_message);
   CHECK_EQ(0, last_event_status);
-  histogramTimer->Stop();
+  histogramTimer.Stop();
   CHECK_EQ("V8.Test", last_event_message);
   CHECK_EQ(1, last_event_status);
 }
 
 
 TEST(Promises) {
   LocalContext context;
   v8::Isolate* isolate = context->GetIsolate();
   v8::HandleScope scope(isolate);
   Handle<Object> global = context->Global();
@@ skipping 190 matching lines @@
   Local<Script> script = v8::ScriptCompiler::Compile(
       isolate, &script_source);
   Local<Value> script_name = script->GetUnboundScript()->GetScriptName();
   CHECK(!script_name.IsEmpty());
   CHECK(script_name->IsString());
   String::Utf8Value utf8_name(script_name);
   CHECK_EQ(url, *utf8_name);
   int line_number = script->GetUnboundScript()->GetLineNumber(0);
   CHECK_EQ(13, line_number);
 }