Revert of Added <link rel=preconnect> crossorigin attribute

Source/core/html/CrossOriginAttribute.h

Index: Source/core/html/CrossOriginAttribute.h
diff --git a/Source/core/html/CrossOriginAttribute.h b/Source/core/html/CrossOriginAttribute.h
deleted file mode 100644
index 480803cf792b63ddae6dd4d1fcdc09a6a6ea08b9..0000000000000000000000000000000000000000
--- a/Source/core/html/CrossOriginAttribute.h
+++ /dev/null
@@ -1,19 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CrossOriginAttribute_h
-#define CrossOriginAttribute_h
-
-#include "public/platform/WebCrossOriginAttribute.h"
-#include "wtf/text/WTFString.h"
-
-namespace blink {
-
-CrossOriginAttributeValue crossOriginAttributeValue(const String& value);
-
-} // namespace blink
-
-#endif
-
-