Eliminate multi-callback structure for LibraryLoader.

pkg/compiler/lib/src/patch_parser.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 library contains the infrastructure to parse and integrate patch files.
  *
  * Three types of elements can be patched: [LibraryElement], [ClassElement],
  * [FunctionElement]. Patches are introduced in patch libraries which are loaded
  * together with the corresponding origin library. Which libraries that are
@@ skipping 345 matching lines @@
       MetadataAnnotation annotation, ConstantValue constant);
 
   /// Checks [element] for metadata matching the [handler]. Return a non-null
   /// annotation marker matching metadata was found.
   static T checkAnnotation<T>(
       Compiler compiler, Element element, EagerAnnotationHandler<T> handler) {
     for (MetadataAnnotation annotation in element.implementation.metadata) {
       T result = handler.apply(compiler, element, annotation);
       if (result != handler.defaultResult) {
         // TODO(johnniwinther): Perform this check in
-        // [Compiler.onLibrariesLoaded].
+        // [Compiler.processLoadedLibraries].
         compiler.libraryLoader
             .registerDeferredAction(new DeferredAction(element, () {
           annotation.ensureResolved(compiler.resolution);
           handler.validate(compiler, element, annotation,
               compiler.constants.getConstantValue(annotation.constant));
         }));
         return result;
       }
     }
     return handler.defaultResult;
@@ skipping 150 matching lines @@
 
 class PatchVersion {
   final String tag;
 
   const PatchVersion(this.tag);
 
   bool isActive(String patchTag) => tag == null || tag == patchTag;
 
   String toString() => 'PatchVersion($tag)';
 }