Remove redefinitions of ExceptionCode.

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

Index: third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.h
diff --git a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.h b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.h
index ea5b40ec8f8f0bd0f645f987975aacd798b744be..9d6c695305a364167b687de0d9989c99e7ce6a2e 100644
--- a/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.h
+++ b/third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.h
@@ -28,6 +28,7 @@
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "bindings/core/v8/TraceWrapperMember.h"
 #include "core/dom/DocumentParserClient.h"
+#include "core/dom/ExceptionCode.h"
 #include "core/dom/SuspendableObject.h"
 #include "core/loader/ThreadableLoaderClient.h"
 #include "core/xmlhttprequest/XMLHttpRequestEventTarget.h"
@@ -42,7 +43,6 @@
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/text/AtomicString.h"
-#include "wtf/text/StringBuilder.h"
 #include "wtf/text/WTFString.h"
 #include <memory>
 
@@ -65,8 +65,6 @@ class ThreadableLoader;
 class WebDataConsumerHandle;
 class XMLHttpRequestUpload;
 
-typedef int ExceptionCode;
-
 class XMLHttpRequest final : public XMLHttpRequestEventTarget,
                              private ThreadableLoaderClient,
                              public DocumentParserClient,