Oilpan: avoid using WeakPtr<> for heap residing objects.

Source/modules/cachestorage/CacheStorage.cpp

Index: Source/modules/cachestorage/CacheStorage.cpp
diff --git a/Source/modules/cachestorage/CacheStorage.cpp b/Source/modules/cachestorage/CacheStorage.cpp
index f6f4f0cf1280f7fe18b2dca35884369da1e59589..d2b3d3c22033dba11f8009032eefe1a88750d917 100644
--- a/Source/modules/cachestorage/CacheStorage.cpp
+++ b/Source/modules/cachestorage/CacheStorage.cpp
@@ -203,7 +203,7 @@ private:
     Persistent<ScriptPromiseResolver> m_resolver;
 };
 
-CacheStorage* CacheStorage::create(WeakPtr<GlobalFetch::ScopedFetcher> fetcher, WebServiceWorkerCacheStorage* webCacheStorage)
+CacheStorage* CacheStorage::create(WeakPtrWillBeRawPtr<GlobalFetch::ScopedFetcher> fetcher, WebServiceWorkerCacheStorage* webCacheStorage)
 {
     return new CacheStorage(fetcher, adoptPtr(webCacheStorage));
 }
@@ -313,7 +313,7 @@ ScriptPromise CacheStorage::matchImpl(ScriptState* scriptState, const Request* r
     return promise;
 }
 
-CacheStorage::CacheStorage(WeakPtr<GlobalFetch::ScopedFetcher> fetcher, PassOwnPtr<WebServiceWorkerCacheStorage> webCacheStorage)
+CacheStorage::CacheStorage(WeakPtrWillBeRawPtr<GlobalFetch::ScopedFetcher> fetcher, PassOwnPtr<WebServiceWorkerCacheStorage> webCacheStorage)
     : m_scopedFetcher(fetcher)
     , m_webCacheStorage(webCacheStorage)
 {
@@ -330,6 +330,7 @@ void CacheStorage::dispose()
 
 DEFINE_TRACE(CacheStorage)
 {
+    visitor->trace(m_scopedFetcher);
     visitor->trace(m_nameToCacheMap);
 }