XHR.abort(): no event dispatching in completed/non-started states.

Source/core/xml/XMLHttpRequest.cpp

Index: Source/core/xml/XMLHttpRequest.cpp
diff --git a/Source/core/xml/XMLHttpRequest.cpp b/Source/core/xml/XMLHttpRequest.cpp
index 0d4d2feccf831abf29a42c4dbe624d482954e540..2dbc810eded218b7ad79de94938bc43cd2695013 100644
--- a/Source/core/xml/XMLHttpRequest.cpp
+++ b/Source/core/xml/XMLHttpRequest.cpp
@@ -856,14 +856,16 @@ void XMLHttpRequest::abort()
     // Clear headers as required by the spec
     m_requestHeaders.clear();
 
-    if ((m_state <= OPENED && !sendFlag) || m_state == DONE)
-        m_state = UNSENT;
-    else {
-        ASSERT(!m_loader);
-        changeState(DONE);
+    if ((m_state <= OPENED && !sendFlag) || m_state == DONE) {
+        // No readystatechange event is dispatched.
         m_state = UNSENT;
+        return;
     }
 
+    ASSERT(!m_loader);
+    changeState(DONE);
+    m_state = UNSENT;
+
     m_progressEventThrottle.dispatchEventAndLoadEnd(XMLHttpRequestProgressEvent::create(EventTypeNames::abort));
     if (!m_uploadComplete) {
         m_uploadComplete = true;