added printWarnings option to HtmlDiff

utils/apidoc/apidoc.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.
 
 /**
  * This generates the reference documentation for the core libraries that come
  * with dart. It is built on top of dartdoc, which is a general-purpose library
  * for generating docs from any Dart code. This library extends that to include
  * additional information and styling specific to our standard library.
  *
@@ skipping 72 matching lines @@
   var files = new VMFileSystem();
   parseOptions(frogPath, ['', '', '--libdir=$frogPath/lib'], files);
   initializeWorld(files);
 
   print('Parsing MDN data...');
   final mdnFile = new File('${doc.scriptDir}/mdn/database.json');
   final mdn = JSON.parse(mdnFile.readAsTextSync());
 
   print('Cross-referencing dart:dom and dart:html...');
   HtmlDiff.initialize();
-  _diff = new HtmlDiff();
+  _diff = new HtmlDiff(printWarnings:false);
   _diff.run();
   world.reset();
 
   // Add all of the core libraries.
   world.getOrAddLibrary('dart:core');
   world.getOrAddLibrary('dart:coreimpl');
   world.getOrAddLibrary('dart:json');
   world.getOrAddLibrary('dart:dom');
   world.getOrAddLibrary('dart:html');
   world.getOrAddLibrary('dart:io');
@@ skipping 385 matching lines @@
       return
           '''
           <p class="correspond">This corresponds to $domTypesText in the
           ${a("dom.html", "dart:dom")} library.</p>
           ''';
     }
 
     return '';
   }
 }