Have ScriptPromiseResolver on the Oilpan heap always.

Source/modules/audio_output_devices/HTMLMediaElementAudioOutputDevice.cpp

Index: Source/modules/audio_output_devices/HTMLMediaElementAudioOutputDevice.cpp
diff --git a/Source/modules/audio_output_devices/HTMLMediaElementAudioOutputDevice.cpp b/Source/modules/audio_output_devices/HTMLMediaElementAudioOutputDevice.cpp
index 0083ca037db6f92d05ad6f32fbd694b8c784de63..cada1302fb5110c00954984f8f9c97a6fefb7fa5 100644
--- a/Source/modules/audio_output_devices/HTMLMediaElementAudioOutputDevice.cpp
+++ b/Source/modules/audio_output_devices/HTMLMediaElementAudioOutputDevice.cpp
@@ -35,7 +35,7 @@ ScriptPromise HTMLMediaElementAudioOutputDevice::setSinkId(ScriptState* scriptSt
     if (!webMediaPlayer)
         return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(AbortError, "No media player available"));
 
-    RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     webMediaPlayer->setSinkId(sinkId, new SetSinkIdCallbacks(resolver, element, sinkId));
     return resolver->promise();
 }