Update Isolate::RequestGarbageCollection after r18691

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 7103 matching lines @@
     prev.SetWeak<Value, Snorkel<Value> >(new Snorkel<Value>(&prev.As<Value>()),
                                          &HandleWeakReference);
   }
   whammy->objects_[whammy->cursor_].Reset(info.GetIsolate(), obj);
   whammy->cursor_ = (whammy->cursor_ + 1) % Whammy::kObjectCount;
   info.GetReturnValue().Set(whammy->getScript()->Run());
 }
 
 
 THREADED_TEST(WeakReference) {
+  i::FLAG_expose_gc = true;
   v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope handle_scope(isolate);
   v8::Handle<v8::ObjectTemplate> templ= v8::ObjectTemplate::New(isolate);
   Whammy* whammy = new Whammy(CcTest::isolate());
   templ->SetNamedPropertyHandler(WhammyPropertyGetter,
                                  0, 0, 0, 0,
                                  v8::External::New(CcTest::isolate(), whammy));
   const char* extension_list[] = { "v8/gc" };
   v8::ExtensionConfiguration extensions(1, extension_list);
   v8::Handle<Context> context =
@@ skipping 6338 matching lines @@
 #ifdef DEBUG
   if (count != expected) CcTest::heap()->TracePathToGlobal();
 #endif
   CHECK_EQ(expected, count);
 }
 
 
 TEST(DontLeakGlobalObjects) {
   // Regression test for issues 1139850 and 1174891.
 
+  i::FLAG_expose_gc = true;
   v8::V8::Initialize();
 
   for (int i = 0; i < 5; i++) {
     { v8::HandleScope scope(CcTest::isolate());
       LocalContext context;
     }
     v8::V8::ContextDisposedNotification();
     CheckSurvivingGlobalObjectsCount(0);
 
     { v8::HandleScope scope(CcTest::isolate());
@@ skipping 8323 matching lines @@
   context->Global()->Set(v8_str("P"), templ->NewInstance());
   CompileRun(
       "function C1() {"
       "  this.x = 23;"
       "};"
       "C1.prototype = P;"
       "for (var i = 0; i < 4; i++ ) {"
       "  new C1();"
       "}");
 }