Revert "Handle most qualified sends."

pkg/compiler/lib/src/resolution/resolution_common.dart

 // Copyright (c) 2015, 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 resolution;
 
 class ResolverTask extends CompilerTask {
   final ConstantCompiler constantCompiler;
 
   ResolverTask(Compiler compiler, this.constantCompiler) : super(compiler);
 
   String get name => 'Resolver';
 
   WorldImpact resolve(Element element) {
     return measure(() {
-      if (Elements.isErroneous(element)) {
-        // TODO(johnniwinther): Add a predicate for this.
-        assert(invariant(element, element is! ErroneousElement,
-            message: "Element $element expected to have parse errors."));
-        _ensureTreeElements(element);
-        return const WorldImpact();
-      }
+      if (Elements.isErroneous(element)) return null;
 
       WorldImpact processMetadata([WorldImpact result]) {
         for (MetadataAnnotation metadata in element.metadata) {
           metadata.ensureResolved(compiler);
         }
         return result;
       }
 
       ElementKind kind = element.kind;
       if (identical(kind, ElementKind.GENERATIVE_CONSTRUCTOR) ||
@@ skipping 1015 matching lines @@
 
   void reportDuplicateDefinition(String name,
                                  Spannable definition,
                                  Spannable existing) {
     compiler.reportError(definition,
         MessageKind.DUPLICATE_DEFINITION, {'name': name});
     compiler.reportInfo(existing,
         MessageKind.EXISTING_DEFINITION, {'name': name});
   }
 }