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

utils/pub/yaml/parser.dart

Index: utils/pub/yaml/parser.dart
===================================================================
--- utils/pub/yaml/parser.dart	(revision 13683)
+++ utils/pub/yaml/parser.dart	(working copy)
@@ -915,7 +915,7 @@
       if (!truth(c_indicator(C_DOUBLE_QUOTE))) return null;
       var contents = nb_doubleText(indent, ctx);
       if (!truth(c_indicator(C_DOUBLE_QUOTE))) return null;
-      return new _ScalarNode("!", contents);
+      return new _ScalarNode("!", content: contents);
     });
   });
 
@@ -1003,7 +1003,7 @@
       if (!truth(c_indicator(C_SINGLE_QUOTE))) return null;
       var contents = nb_singleText(indent, ctx);
       if (!truth(c_indicator(C_SINGLE_QUOTE))) return null;
-      return new _ScalarNode("!", contents);
+      return new _ScalarNode("!", content: contents);
     });
   });
 
@@ -1535,7 +1535,7 @@
     var content = l_literalContent(indent + additionalIndent, header.chomping);
     if (!truth(content)) return null;
 
-    return new _ScalarNode("!", content);
+    return new _ScalarNode("!", content: content);
   });
 
   // 171
@@ -1572,7 +1572,7 @@
     var content = l_foldedContent(indent + additionalIndent, header.chomping);
     if (!truth(content)) return null;
 
-    return new _ScalarNode("!", content);
+    return new _ScalarNode("!", content: content);
   });
 
   // 175