Change core lib, dart2js, and more for new optional parameters syntax

pkg/dartdoc/lib/dartdoc.dart

Index: pkg/dartdoc/lib/dartdoc.dart
===================================================================
--- pkg/dartdoc/lib/dartdoc.dart	(revision 13683)
+++ pkg/dartdoc/lib/dartdoc.dart	(working copy)
@@ -1605,7 +1605,7 @@
   }
 
   /** Generates a human-friendly string representation for a type. */
-  typeName(TypeMirror type, [bool showBounds = false]) {
+  typeName(TypeMirror type, {bool showBounds: false}) {
     if (type.isVoid) {
       return 'void';
     }
@@ -1676,9 +1676,9 @@
    * style it appropriately.
    */
   md.Node resolveNameReference(String name,
-                               [MemberMirror currentMember = null,
-                                ObjectMirror currentType = null,
-                                LibraryMirror currentLibrary = null]) {
+                               {MemberMirror currentMember,
+                                ObjectMirror currentType,
+                                LibraryMirror currentLibrary}) {
     makeLink(String href) {
       final anchor = new md.Element.text('a', name);
       anchor.attributes['href'] = relativePath(href);