[Loader] Make ThreadableLoader non-RefCounted and be managed by OwnPtr

third_party/WebKit/Source/modules/fetch/FetchManager.cpp

Index: third_party/WebKit/Source/modules/fetch/FetchManager.cpp
diff --git a/third_party/WebKit/Source/modules/fetch/FetchManager.cpp b/third_party/WebKit/Source/modules/fetch/FetchManager.cpp
index f980ff758f9424cd34d58d3fc18eb3f6631fbe28..292918b7f9e99153517cdf3762686f0d29bf4360 100644
--- a/third_party/WebKit/Source/modules/fetch/FetchManager.cpp
+++ b/third_party/WebKit/Source/modules/fetch/FetchManager.cpp
@@ -165,7 +165,7 @@ private:
     Member<FetchManager> m_fetchManager;
     Member<ScriptPromiseResolver> m_resolver;
     Member<FetchRequestData> m_request;
-    RefPtr<ThreadableLoader> m_loader;
+    OwnPtr<ThreadableLoader> m_loader;
     bool m_failed;
     bool m_finished;
     int m_responseHttpStatusCode;