Add a pre-finalizer for XHR to cancel the loader

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 9793325ff96d0bc872026c77500a663326e8ad10..e766eef1cb347c81f669ebf9600bc0d3ab754297 100644
--- a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
+++ b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp
@@ -1104,6 +1104,13 @@ void XMLHttpRequest::abort() {
     m_state = kUnsent;
 }
 
+void XMLHttpRequest::dispose() {
+  if (m_loader) {
+    m_error = true;
+    m_loader->cancel();
+  }
+}
+
 void XMLHttpRequest::clearVariablesForLoading() {
   if (m_blobLoader) {
     m_blobLoader->cancel();