Replace Timers used in ActiveDOMObject with AsyncMethodRunner

Source/core/xml/XMLHttpRequest.h

Index: Source/core/xml/XMLHttpRequest.h
diff --git a/Source/core/xml/XMLHttpRequest.h b/Source/core/xml/XMLHttpRequest.h
index 29efa0d260660a50c423460c8133a7b9c600f84e..f2a689497ff16ae3cd4e6b43f69e1a59be10382b 100644
--- a/Source/core/xml/XMLHttpRequest.h
+++ b/Source/core/xml/XMLHttpRequest.h
@@ -30,6 +30,7 @@
 #include "core/loader/ThreadableLoaderClient.h"
 #include "core/xml/XMLHttpRequestEventTarget.h"
 #include "core/xml/XMLHttpRequestProgressEventThrottle.h"
+#include "platform/AsyncMethodRunner.h"
 #include "platform/network/FormData.h"
 #include "platform/network/ResourceResponse.h"
 #include "weborigin/SecurityOrigin.h"
@@ -172,7 +173,7 @@ private:
     void dispatchReadyStateChangeEvent();
 
     void dropProtectionSoon();
-    void dropProtection(Timer<XMLHttpRequest>* = 0);
+    void dropProtection();
     // Clears variables used only while the resource is being loaded.
     void clearVariablesForLoading();
     // Returns false iff reentry happened and a new load is started.
@@ -249,7 +250,7 @@ private:
 
     // An enum corresponding to the allowed string values for the responseType attribute.
     ResponseTypeCode m_responseTypeCode;
-    Timer<XMLHttpRequest> m_protectionTimer;
+    AsyncMethodRunner<XMLHttpRequest> m_dropProtectionRunner;
     RefPtr<SecurityOrigin> m_securityOrigin;
 };