Refactor IsolateHolder to be able to always create the isolate

mojo/apps/js/test/js_to_cpp_unittest.cc

 // Copyright 2014 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/at_exit.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
+#include "gin/array_buffer.h"
 #include "gin/public/isolate_holder.h"
 #include "mojo/apps/js/mojo_runner_delegate.h"
 #include "mojo/apps/js/test/js_to_cpp.mojom.h"
 #include "mojo/common/common_type_converters.h"
 #include "mojo/common/test/test_utils.h"
 #include "mojo/public/cpp/system/core.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
@@ skipping 370 matching lines @@
 
     MessagePipe pipe;
     js_to_cpp::JsSidePtr js_side =
         MakeProxy<js_to_cpp::JsSide>(pipe.handle0.Pass());
     js_side.set_client(cpp_side);
 
     js_side.internal_state()->router_for_testing()->EnableTestingMode();
 
     cpp_side->set_js_side(js_side.get());
 
-    gin::IsolateHolder instance(gin::IsolateHolder::kStrictMode);
+    gin::IsolateHolder::Initialize(gin::IsolateHolder::kStrictMode,
+                                   gin::ArrayBufferAllocator::SharedInstance());
+    gin::IsolateHolder instance;
     apps::MojoRunnerDelegate delegate;
     gin::ShellRunner runner(&delegate, instance.isolate());
     delegate.Start(&runner, pipe.handle1.release().value(), test);
 
     run_loop_.Run();
   }
 
  private:
   base::ShadowingAtExitManager at_exit_;
   base::MessageLoop loop;
@@ skipping 33 matching lines @@
   if (IsRunningOnIsolatedBot())
     return;
 
   BackPointerCppSideConnection cpp_side_connection;
   RunTest("mojo/apps/js/test/js_to_cpp_unittest", &cpp_side_connection);
   EXPECT_TRUE(cpp_side_connection.DidSucceed());
 }
 
 }  // namespace js
 }  // namespace mojo