Remove usage of deprecated APIs from cctests

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 40 matching lines @@
     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(
+        v8::String::NewFromUtf8(
+          isolate,
           "for (var i = 0; i < 3; i++) {"
           "  var result = \"a\".search(\"a\");"
           "  if (result != 0) throw \"result: \" + result + \" @\" + i;"
           "};"
           "true"));
     CHECK(script->Run()->IsTrue());
 
     turn = CLEAN_CACHE;
     do {
       {
@@ skipping 112 matching lines @@
     Join();
   }
 };
 
 
 TEST(ThreadJoinSelf) {
   ThreadC thread;
   thread.Start();
   thread.Join();
 }