Update types to unbreak build.

dart/lib/compiler/implementation/compiler.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
 const bool REPORT_EXCESS_RESOLUTION = false;
@@ skipping 730 matching lines @@
     if (element === null) {
       element = currentElement;
     }
     Token position = element.position();
     Uri uri = element.getCompilationUnit().script.uri;
     return (position === null)
         ? new SourceSpan(uri, 0, 0)
         : spanFromTokens(position, position, uri);
   }
 
-  Script readScript(Uri uri, [LibraryTag node]) {
+  Script readScript(Uri uri, [Node node]) {
     unimplemented('Compiler.readScript');
   }
 
   String get legDirectory {
     unimplemented('Compiler.legDirectory');
   }
 
   // TODO(karlklose): split into findHelperFunction and findHelperClass and
   // add a check that the element has the expected kind.
   Element findHelper(SourceString name)
@@ skipping 86 matching lines @@
  * information in the generated error message.
  */
 bool invariant(Spannable spannable, var condition, {String message: null}) {
   // TODO(johnniwinther): Use [spannable] and [message] to provide better
   // information on assertion errors.
   if (condition is Function){
     condition = condition();
   }
   return spannable != null && condition;
 }