Oilpan: have DOMException be on the heap by default.

Source/modules/cachestorage/CacheStorage.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/CacheStorage.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/ExceptionCode.h"
 #include "modules/fetch/Request.h"
 #include "modules/fetch/Response.h"
 #include "public/platform/WebServiceWorkerCacheError.h"
 #include "public/platform/WebServiceWorkerCacheStorage.h"
 
 namespace blink {
 
 namespace {
 
-PassRefPtrWillBeRawPtr<DOMException> createNoImplementationException()
+DOMException* createNoImplementationException()
 {
     return DOMException::create(NotSupportedError, "No CacheStorage implementation provided.");
 }
 
 }
 
 // FIXME: Consider using CallbackPromiseAdapter.
 class CacheStorage::Callbacks final : public WebServiceWorkerCacheStorage::CacheStorageCallbacks {
     WTF_MAKE_NONCOPYABLE(Callbacks);
 public:
@@ skipping 241 matching lines @@
     visitor->trace(m_nameToCacheMap);
 }
 
 CacheStorage::CacheStorage(WeakPtr<GlobalFetch::ScopedFetcher> fetcher, PassOwnPtr<WebServiceWorkerCacheStorage> webCacheStorage)
     : m_scopedFetcher(fetcher)
     , m_webCacheStorage(webCacheStorage)
 {
 }
 
 } // namespace blink