remove remaining uses of default isolate in tests

test/cctest/test-threads.cc

 // Copyright 2008 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 53 matching lines @@
 
 static Turn turn = FILL_CACHE;
 
 
 class ThreadA : public v8::internal::Thread {
  public:
   ThreadA() : Thread("ThreadA") { }
   void Run() {
     v8::Isolate* isolate = CcTest::isolate();
     v8::Locker locker(isolate);
+    v8::Isolate::Scope isolate_scope(isolate);
     v8::HandleScope scope(isolate);
     v8::Handle<v8::Context> context = v8::Context::New(isolate);
     v8::Context::Scope context_scope(context);
 
     CHECK_EQ(FILL_CACHE, turn);
 
     // Fill String.search cache.
     v8::Handle<v8::Script> script = v8::Script::Compile(
         v8::String::New(
           "for (var i = 0; i < 3; i++) {"
@@ skipping 20 matching lines @@
 
 
 class ThreadB : public v8::internal::Thread {
  public:
   ThreadB() : Thread("ThreadB") { }
   void Run() {
     do {
       {
         v8::Isolate* isolate = CcTest::isolate();
         v8::Locker locker(isolate);
+        v8::Isolate::Scope isolate_scope(isolate);
         if (turn == CLEAN_CACHE) {
           v8::HandleScope scope(isolate);
           v8::Handle<v8::Context> context = v8::Context::New(isolate);
           v8::Context::Scope context_scope(context);
 
           // Clear the caches by forcing major GC.
           CcTest::heap()->CollectAllGarbage(v8::internal::Heap::kNoGCFlags);
           turn = SECOND_TIME_FILL_CACHE;
           break;
         }
       }
 
       Thread::YieldCPU();
     } while (true);
   }
 };
 
 
-UNINITIALIZED_TEST(JSFunctionResultCachesInTwoThreads) {
-  v8::V8::Initialize();
-
+TEST(JSFunctionResultCachesInTwoThreads) {
   ThreadA threadA;
   ThreadB threadB;
 
   threadA.Start();
   threadB.Start();
 
   threadA.Join();
   threadB.Join();
 
   CHECK_EQ(DONE, turn);
@@ skipping 61 matching lines @@
     Join();
   }
 };
 
 
 TEST(ThreadJoinSelf) {
   ThreadC thread;
   thread.Start();
   thread.Join();
 }