Use generated copy and compare for VerticalAlign in ComputedStyle.

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

Index: third_party/WebKit/Source/core/css/ComputedStyleExtraFields.json5
diff --git a/third_party/WebKit/Source/core/css/ComputedStyleExtraFields.json5 b/third_party/WebKit/Source/core/css/ComputedStyleExtraFields.json5
index d9eb365dfedf239342d382e5def8a425cbd15610..a58f7560198f6eda01ac82eab91a435d4024b78d 100644
--- a/third_party/WebKit/Source/core/css/ComputedStyleExtraFields.json5
+++ b/third_party/WebKit/Source/core/css/ComputedStyleExtraFields.json5
@@ -153,7 +153,7 @@
       has_custom_compare_and_copy: true,
     },
     // TODO(shend): vertical align is actually a CSS property, but since we don't support union fields
-    // which can be either a keyword or Length, this is generated as a nonproperty for now. Remove this
+    // which can be either a keyword or Length, this is generated in this file for now. Remove this

[Bugs Nash, 2017/04/24 00:33:42]

Please add to this comment where in this file (function name?) this is generated

[shend, 2017/04/24 00:43:50]

Oops, the comment is misleading. Changed.

     // once we can support union fields and groups.
     {
       name: "VerticalAlign",
@@ -161,7 +161,6 @@
       field_size: 4,
       default_value: "EVerticalAlign::kBaseline",
       type_name: "EVerticalAlign",
-      has_custom_compare_and_copy: true,
     },
   ],
 }