Have ScriptPromiseResolver on the Oilpan heap always.

Source/modules/webaudio/AudioContext.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/webaudio/AudioContext.h"
 
 #include "bindings/core/v8/ExceptionMessages.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
@@ skipping 64 matching lines @@
 {
     visitor->trace(m_closeResolver);
     AbstractAudioContext::trace(visitor);
 }
 
 ScriptPromise AudioContext::suspendContext(ScriptState* scriptState)
 {
     ASSERT(isMainThread());
     AutoLocker locker(this);
 
-    RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
 
     if (contextState() == Closed) {
         resolver->reject(
             DOMException::create(InvalidStateError, "Cannot suspend a context that has been closed"));
     } else {
         // Stop rendering now.
         if (destination())
             stopRendering();
 
@@ skipping 10 matching lines @@
     ASSERT(isMainThread());
 
     if (isContextClosed()) {
         return ScriptPromise::rejectWithDOMException(
             scriptState,
             DOMException::create(
                 InvalidAccessError,
                 "cannot resume a closed AudioContext"));
     }
 
-    RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
+    ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
 
     // Restart the destination node to pull on the audio graph.
     if (destination())
         startRendering();
 
     // Save the resolver which will get resolved when the destination node starts pulling on the
     // graph again.
     {
         AutoLocker locker(this);
@@ skipping 52 matching lines @@
     if (contextState() == Running) {
         destination()->audioDestinationHandler().stopRendering();
         setContextState(Suspended);
         deferredTaskHandler().clearHandlersToBeDeleted();
     }
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)