Have ScriptPromiseResolver on the Oilpan heap always.

Source/modules/cachestorage/CacheTest.cpp

 // 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 "config.h"
 #include "modules/cachestorage/Cache.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptFunction.h"
 #include "bindings/core/v8/ScriptPromise.h"
@@ skipping 36 matching lines @@
         ++m_fetchCount;
         if (m_expectedUrl) {
             String fetchedUrl;
             if (requestInfo.isRequest())
                 EXPECT_EQ(*m_expectedUrl, requestInfo.getAsRequest()->url());
             else
                 EXPECT_EQ(*m_expectedUrl, requestInfo.getAsUSVString());
         }
 
         if (m_response) {
-            RefPtrWillBeRawPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
+            ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
             const ScriptPromise promise = resolver->promise();
             resolver->resolve(m_response);
             m_response = nullptr;
             return promise;
         }
         return ScriptPromise::reject(scriptState, V8ThrowException::createTypeError(scriptState->isolate(), "Unexpected call to fetch, no response available."));
     }
 
     WeakPtr<GlobalFetch::ScopedFetcher> weakPtr()
     {
@@ skipping 575 matching lines @@
 
     ScriptPromise addResult = cache->add(scriptState(), requestToRequestInfo(request), exceptionState());
 
     EXPECT_EQ(kNotImplementedString, getRejectString(addResult));
     EXPECT_EQ(1, fetcher()->fetchCount());
     EXPECT_EQ("dispatchBatch", testCache->getAndClearLastErrorWebCacheMethodCalled());
 }
 
 } // namespace
 } // namespace blink