Use generated copy and compare for OriginalDisplay in ComputedStyle.

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

 {
 // This file specifies fields in ComputedStyle that we would like to
 // generate, but are not CSS properties.
 
   parameters: {
     // - field_size
     // Number of bits needed to store this field. Only used for storage_only
     // fields. If specified, the field will be stored as bit field. Otherwise
     // it will be stored as a normal data member.
     field_size: {
@@ skipping 22 matching lines @@
     {
       name: "OriginalDisplay",
       field_template: "keyword",
       default_value: "inline",
       type_name: "EDisplay",
       keywords: [
           "inline", "block", "list-item", "inline-block", "table", "inline-table", "table-row-group", "table-header-group",
           "table-footer-group", "table-row", "table-column-group", "table-column", "table-cell", "table-caption", "-webkit-box",
           "-webkit-inline-box", "flex", "inline-flex", "grid", "inline-grid", "contents", "flow-root", "none",
       ],
-      has_custom_compare_and_copy: true,
     },
     {
       name: "InsideLink",
       field_template: "keyword",
       default_value: "not-inside-link",
       keywords: ["not-inside-link", "inside-unvisited-link", "inside-visited-link"],
       inherited: true,
       has_custom_compare_and_copy: true,
     },
     // Style can not be shared.
@@ skipping 105 matching lines @@
     {
       name: "VerticalAlign",
       field_template: "storage_only",
       field_size: 4,
       default_value: "EVerticalAlign::kBaseline",
       type_name: "EVerticalAlign",
       has_custom_compare_and_copy: true,
     },
   ],
 }