Refactor CSS utility functions and remove unused files

src/build/utils/css.ts

@@ -4,8 +4,3 @@ export function hyphenToCamelCase(name: string): string {
     .replace(/-(\w)/g, (_, c) => c.toUpperCase());
   return camel === "float" ? "_float" : camel;
 }
-
-export function camelToHyphenCase(name: string): string {
-  const dashPrefix = name.startsWith("webkit") ? "-" : "";
-  return dashPrefix + name.replace(/[A-Z]/g, (c) => "-" + c.toLowerCase());
-}

src/build/webref/css.ts

@@ -1,8 +1,7 @@
-function hyphenToCamelCase(name: string) {
-  const camel = name
-    .replace(/^-(\w)/, (_, c) => c)
-    .replace(/-(\w)/g, (_, c) => c.toUpperCase());
-  return camel === "float" ? "_float" : camel;
+import { hyphenToCamelCase } from "../utils/css.js";
+export function camelToHyphenCase(name: string): string {
+  const dashPrefix = name.startsWith("webkit") ? "-" : "";
+  return dashPrefix + name.replace(/[A-Z]/g, (c) => "-" + c.toLowerCase());
 }
 
 export function generateWebIdlFromCssProperties(properties: string[]): string {