Random fixes discovered when looking through CL 11824035.

sdk/lib/_internal/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.
 
 part of dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 611 matching lines @@
         library.addToScope(jsIndexingBehaviorInterface, this);
       }
     }
   }
 
   void maybeEnableIsolateHelper(LibraryElement library) {
     String libraryName = library.uri.toString();
     if (libraryName == 'dart:isolate'
         || libraryName == 'dart:html'
         // TODO(floitsch): create a separate async-helper library instead of
-        // importing the isolate-library just for async.
+        // importing the isolate-library just for TimerImpl.
         || libraryName == 'dart:async') {
       importIsolateHelperLibrary(library);
     }
   }
 
   void runCompiler(Uri uri) {
     log('compiling $uri ($BUILD_ID)');
     scanBuiltinLibraries();
     mainApp = libraryLoader.loadLibrary(uri, null, uri);
     libraries.forEach((_, library) {
@@ skipping 429 matching lines @@
   // TODO(johnniwinther): Use [spannable] and [message] to provide better
   // information on assertion errors.
   if (condition is Function){
     condition = condition();
   }
   if (spannable == null || !condition) {
     throw new SpannableAssertionFailure(spannable, message);
   }
   return true;
 }