Refactor IsolateHolder to be able to always create the isolate

mojo/apps/js/main.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/message_loop/message_loop.h"
+#include "gin/array_buffer.h"
 #include "gin/public/isolate_holder.h"
 #include "mojo/apps/js/mojo_runner_delegate.h"
 #include "mojo/public/cpp/system/core.h"
 #include "mojo/public/cpp/system/macros.h"
 
 #if defined(WIN32)
 #if !defined(CDECL)
 #define CDECL __cdecl
 #endif
 #define MOJO_APPS_JS_EXPORT __declspec(dllexport)
 #else
 #define CDECL
 #define MOJO_APPS_JS_EXPORT __attribute__((visibility("default")))
 #endif
 
 namespace mojo {
 namespace apps {
 
 void Start(MojoHandle pipe, const std::string& module) {
   base::MessageLoop loop;
 
-  gin::IsolateHolder instance(gin::IsolateHolder::kStrictMode);
+  gin::IsolateHolder::Initialize(gin::IsolateHolder::kStrictMode,
+                                 gin::ArrayBufferAllocator::SharedInstance());
+  gin::IsolateHolder instance;
   MojoRunnerDelegate delegate;
   gin::ShellRunner runner(&delegate, instance.isolate());
   delegate.Start(&runner, pipe, module);
 
   base::MessageLoop::current()->Run();
 }
 
 }  // namespace apps
 }  // namespace mojo
 
 extern "C" MOJO_APPS_JS_EXPORT MojoResult CDECL MojoMain(MojoHandle pipe) {
   mojo::apps::Start(pipe, "mojo/apps/js/main");
   return MOJO_RESULT_OK;
 }