DO NOT LAND. Revert of https://codereview.chromium.org/2797963002

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 84 matching lines @@
       default_value: "false",
       has_custom_compare_and_copy: true,
     },
     // Explicitly inherits a non-inherited property
     {
       name: "HasExplicitlyInheritedProperties",
       field_template: "monotonic_flag",
       default_value: "false",
       has_custom_compare_and_copy: true,
     },
-    // These are set if we used viewport or rem units when resolving a length.
-    // TODO(shend): HasViewportUnits should be a monotonic_flag.
-    {
-      name: "HasViewportUnits",
-      field_template: "primitive",
-      default_value: "false",
-      type_name: "bool",
-      has_custom_compare_and_copy: true,
-    },
-    {
-      name: "HasRemUnits",
-      field_template: "monotonic_flag",
-      default_value: "false",
-      has_custom_compare_and_copy: true,
-    },
     // These properties only have generated storage, and their methods are handwritten in ComputedStyle.
     // TODO(shend): Remove these fields and delete the 'storage_only' template.
     {
       name: "EmptyState",
       field_template: "storage_only",
       field_size: 1,
       default_value: "false",
       type_name: "bool",
       has_custom_compare_and_copy: true,
     },
@@ skipping 29 matching lines @@
     {
       name: "VerticalAlign",
       field_template: "storage_only",
       field_size: 4,
       default_value: "EVerticalAlign::kBaseline",
       type_name: "EVerticalAlign",
       has_custom_compare_and_copy: true,
     },
   ],
 }