Repair bitrot in the utils/apidoc/mdn/ code. It now runs all the way through,

utils/apidoc/mdn/util.dart

 #library("util");
 
+#import("dart:io");
 #import("dart:json");
 
 Map<String, Map> _allProps;
 
 Map<String, Map> get allProps() {
   if (_allProps == null) {
     // Database of expected property names for each type in WebKit.
-    _allProps = JSON.parse(fs.readFileSync('data/dartIdl.json', 'utf8'));
+    _allProps = JSON.parse(
+        new File('data/dartIdl.json').readAsTextSync());
   }
   return _allProps;
 }
 
 Set<String> matchedTypes;
 
 /** Returns whether the type has any member matching the specified name. */
 bool hasAny(String type, String prop) {
   final data = allProps[type];
   return data['properties'].containsKey(prop) ||
@@ skipping 54 matching lines @@
     if (entry != null) {
       num score = scoreEntry(entry, type);
       if (score > bestScore) {
         bestScore = score;
         bestEntry = entry;
       }
     }
   }
   return bestEntry;
 }
+
+/**
+ * Helper for sync creation of a whole file from a string.
+ */
+void writeFileSync(String filename, String data) {
+  File f = new File(filename);
+  RandomAccessFile raf = f.openSync(FileMode.WRITE);
+  raf.writeStringSync(data);
+  raf.closeSync();
+}