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

Source/modules/cachestorage/Cache.cpp

Index: Source/modules/cachestorage/Cache.cpp
diff --git a/Source/modules/cachestorage/Cache.cpp b/Source/modules/cachestorage/Cache.cpp
index 73c7f8a64a7ab64cd16ffe11f1e07517eb8ae14b..5a122fd27c3fe28418fb690068efb582581a006e 100644
--- a/Source/modules/cachestorage/Cache.cpp
+++ b/Source/modules/cachestorage/Cache.cpp
@@ -277,7 +277,7 @@ private:
     WebServiceWorkerResponse m_webResponse;
 };
 
-Cache* Cache::create(WeakPtr<GlobalFetch::ScopedFetcher> fetcher, PassOwnPtr<WebServiceWorkerCache> webCache)
+Cache* Cache::create(WeakPtrWillBeRawPtr<GlobalFetch::ScopedFetcher> fetcher, PassOwnPtr<WebServiceWorkerCache> webCache)
 {
     return new Cache(fetcher, webCache);
 }
@@ -389,9 +389,16 @@ WebServiceWorkerCache::QueryParams Cache::toWebQueryParams(const CacheQueryOptio
     return webQueryParams;
 }
 
-Cache::Cache(WeakPtr<GlobalFetch::ScopedFetcher> fetcher, PassOwnPtr<WebServiceWorkerCache> webCache)
+Cache::Cache(WeakPtrWillBeRawPtr<GlobalFetch::ScopedFetcher> fetcher, PassOwnPtr<WebServiceWorkerCache> webCache)
     : m_scopedFetcher(fetcher)
-    , m_webCache(webCache) { }
+    , m_webCache(webCache)
+{
+}
+
+DEFINE_TRACE(Cache)
+{
+    visitor->trace(m_scopedFetcher);
+}
 
 ScriptPromise Cache::matchImpl(ScriptState* scriptState, const Request* request, const CacheQueryOptions& options)
 {