Have ScriptPromiseResolver on the Oilpan heap always.

Source/modules/bluetooth/Bluetooth.cpp

 // Copyright 2015 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 "config.h"
 #include "modules/bluetooth/Bluetooth.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
@@ skipping 51 matching lines @@
     if (!webbluetooth)
         return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(NotSupportedError));
 
     // 3. In order to convert the arguments from service names and aliases to just UUIDs, do the following substeps:
     WebRequestDeviceOptions webOptions;
     convertRequestDeviceOptions(options, webOptions, exceptionState);
     if (exceptionState.hadException())
         return exceptionState.reject(scriptState);
 
     // Subsequent steps are handled in the browser process.
-    RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
     webbluetooth->requestDevice(webOptions, new CallbackPromiseAdapter<BluetoothDevice, BluetoothError>(resolver));
     return promise;
 
 }
 
 } // namespace blink