Revert "Prepare blink to unify definitions of load completion"

LayoutTests/http/tests/xmlhttprequest/reentrant-cancel.html

Index: LayoutTests/http/tests/xmlhttprequest/reentrant-cancel.html
diff --git a/LayoutTests/http/tests/xmlhttprequest/reentrant-cancel.html b/LayoutTests/http/tests/xmlhttprequest/reentrant-cancel.html
index b6bb5cd0f2bed9749cfd85b3bfa9d2e23fb74f52..2916ae6a1b1992c839560ed33fd5fd77523c6424 100644
--- a/LayoutTests/http/tests/xmlhttprequest/reentrant-cancel.html
+++ b/LayoutTests/http/tests/xmlhttprequest/reentrant-cancel.html
@@ -23,12 +23,6 @@ var xhr = new XMLHttpRequest;
 function sendXHR()
 {
     xhr.open("GET", "", true);
-    xhr.onreadystatechange = function() {
-        if (xhr.readyState != 4)
-            return;
-        if (window.testRunner)
-            testRunner.notifyDone();
-    };
     xhr.send();
 }
 window.addEventListener("DOMSubtreeModified", sendXHR);