CSS Motion Path: delete implementation of motion shorthand

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 2800 matching lines @@
     },
     {
       name: "margin",
       longhands: "margin-top;margin-right;margin-bottom;margin-left",
     },
     {
       name: "marker",
       longhands: "marker-start;marker-mid;marker-end",
     },
     {
-      name: "motion",
-      longhands: "offset-path;offset-distance;offset-rotation",
-    },
-    {
       name: "offset",
       longhands: "offset-path;offset-distance;offset-rotation",
     },
     {
       name: "outline",
       longhands: "outline-color;outline-style;outline-width",
     },
     {
       name: "overflow",
       longhands: "overflow-x;overflow-y",
@@ skipping 356 matching lines @@
     {
       name: "-webkit-transition-timing-function",
       alias_for: "transition-timing-function",
     },
     {
       name: "-webkit-user-select",
       alias_for: "user-select",
     },
   ],
 }