Add unprefixed -webkit-line-break as an alias to import csswg-test

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 2993 matching lines @@
     },
     {
       name: "-webkit-font-feature-settings",
       alias_for: "font-feature-settings",
     },
     {
       name: "-webkit-justify-content",
       alias_for: "justify-content",
     },
     {
+      name: "line-break",
+      alias_for: "-webkit-line-break",
+      runtime_flag: "CSSLineBreak",
+    },
+    {
       name: "-webkit-opacity",
       alias_for: "opacity",
     },
     {
       name: "-webkit-order",
       alias_for: "order",
     },
     {
       name: "-webkit-perspective",
       alias_for: "perspective",
@@ skipping 49 matching lines @@
     {
       name: "-webkit-transition-timing-function",
       alias_for: "transition-timing-function",
     },
     {
       name: "-webkit-user-select",
       alias_for: "user-select",
     },
   ],
 }