add URL isSameOrigin to WorkerGlobalScope

src/browser/webapi/WorkerGlobalScope.zig

@@ -261,11 +261,7 @@ pub fn headersForRequest(self: *WorkerGlobalScope, transfer: *HttpClient.Transfe
 
 pub fn isSameOrigin(self: *const WorkerGlobalScope, url: [:0]const u8) bool {
     const current_origin = self.origin orelse return false;
-
-    if (!std.mem.startsWith(u8, url, current_origin)) {
-        return false;
-    }
-    return std.mem.eql(u8, URL.getHost(url), URL.getHost(current_origin));
+    return URL.isSameOrigin(url, current_origin);
 }
 
 pub fn makeRequest(self: *WorkerGlobalScope, req: HttpClient.Request) !void {