[CSS Typed OM] Delete obsolete number and length classes from Typed OM

third_party/WebKit/Source/core/css/cssom/CSSPositionValue.idl

 // Copyright 2016 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.
 
 [
-    Constructor(CSSLengthValue x, CSSLengthValue y),
+    Constructor(CSSNumericValue x, CSSNumericValue y),
     Exposed=(Window,PaintWorklet),
     RuntimeEnabled=CSSTypedOM
 ] interface CSSPositionValue : CSSStyleValue {
-    readonly attribute CSSLengthValue x;
-    readonly attribute CSSLengthValue y;
+    readonly attribute CSSNumericValue x;
+    readonly attribute CSSNumericValue y;
 };