CSS Motion Path: delete implementation of motion-offset property

third_party/WebKit/Source/core/css/CSSProperties.json5

 {
 // This file specifies all the CSS properties we support and the necessary
 // information for our code generation. The various supported arguments
 // are described below with example usage
 
   parameters: {
     // - alias_for: "other-property"
     // Properties specifying alias_for should be virtually identical to the
     // properties they alias. Minor parsing differences are allowed as long as
     // the CSSValues created are of the same format of the aliased property.
@@ skipping 1372 matching lines @@
       converter: "ConvertLengthSizing",
       is_descriptor: true,
       interpolable: true,
     },
     {
       name: "mix-blend-mode",
       name_for_methods: "BlendMode",
       type_name: "blink::WebBlendMode",
     },
     {
-      name: "motion-offset",
-      alias_for: "offset-distance",
-    },
-    {
       name: "object-fit",
       type_name: "ObjectFit",
     },
     {
       name: "object-position",
       converter: "ConvertPosition",
       interpolable: true,
     },
     {
       name: "offset-anchor",
@@ skipping 1808 matching lines @@
     {
       name: "-webkit-transition-timing-function",
       alias_for: "transition-timing-function",
     },
     {
       name: "-webkit-user-select",
       alias_for: "user-select",
     },
   ],
 }