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

third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp

Index: third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
diff --git a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
index 518397a75754af814aa9ede59b210c442a7a0cb4..8131df9738393d232caa0972a76868c1f3192327 100644
--- a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
+++ b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
@@ -1019,7 +1019,7 @@ bool XMLHttpRequest::internalAbort()
     // If, window.onload contains open() and send(), m_loader will be set to
     // non 0 value. So, we cannot continue the outer open(). In such case,
     // just abort the outer open() by returning false.
-    RefPtr<ThreadableLoader> loader = m_loader.release();
+    OwnPtr<ThreadableLoader> loader = m_loader.release();
     loader->cancel();
 
     // If abort() called internalAbort() and a nested open() ended up