Revert of Added <link rel=preconnect> crossorigin attribute

public/platform/WebCrossOriginAttribute.h

Index: public/platform/WebCrossOriginAttribute.h
diff --git a/public/platform/WebCrossOriginAttribute.h b/public/platform/WebCrossOriginAttribute.h
deleted file mode 100644
index 390c605721dfecda1b72d2bf0cd4e03db53621da..0000000000000000000000000000000000000000
--- a/public/platform/WebCrossOriginAttribute.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 WebCrossOriginAttribute_h
-#define WebCrossOriginAttribute_h
-
-namespace blink {
-
-enum CrossOriginAttributeValue {
-    CrossOriginAttributeNotSet,
-    CrossOriginAttributeAnonymous,
-    CrossOriginAttributeUseCredentials,
-};
-
-} // namespace blink
-
-#endif
-