Remove support for conflicting constructors.

sdk/lib/_internal/compiler/implementation/elements/modelx.dart

 // Copyright (c) 2013, 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.
 
 library elements.modelx;
 
 import 'dart:collection' show LinkedHashMap;
 
 import 'elements.dart';
 import '../../compiler.dart' as api;
@@ skipping 1391 matching lines @@
   /// constructor in a mixin application.
   final FunctionElement target;
 
   SynthesizedConstructorElementX(Element enclosing)
       : super(enclosing.name, ElementKind.GENERATIVE_CONSTRUCTOR,
               Modifiers.EMPTY, enclosing),
         target = null;
 
   SynthesizedConstructorElementX.forDefault(Element enclosing,
                                             Compiler compiler)
-      : super(enclosing.name, ElementKind.GENERATIVE_CONSTRUCTOR,
+      : super(const SourceString(''), ElementKind.GENERATIVE_CONSTRUCTOR,
               Modifiers.EMPTY, enclosing),
         target = null {
     // TODO(karlklose): get rid of the fake AST.
     type = new FunctionType(this,
         compiler.types.voidType,
         const Link<DartType>(),
         const Link<DartType>(),
         const Link<SourceString>(),
         const Link<DartType>());
     cachedNode = new FunctionExpression(
@@ skipping 368 matching lines @@
             && result.getLibrary() != selector.library)) {
       result = noMatch != null ? noMatch(result) : null;
     }
     return result;
   }
 
   // TODO(aprelev@gmail.com): Peter believes that it would be great to
   // make noMatch a required argument. Peter's suspicion is that most
   // callers of this method would benefit from using the noMatch method.
   Element lookupConstructor(Selector selector, [Element noMatch(Element)]) {
-    SourceString normalizedName;
-    SourceString className = this.name;
-    SourceString constructorName = selector.name;
-    if (constructorName != const SourceString('')) {
-      normalizedName = Elements.constructConstructorName(className,
-                                                         constructorName);
-    } else {
-      normalizedName = className;
-    }
-    Element result = localLookup(normalizedName);
+    Element result = localLookup(selector.name);
     return validateConstructorLookupResults(selector, result, noMatch);
   }
 
   Element lookupFactoryConstructor(Selector selector,
                                    [Element noMatch(Element)]) {
     SourceString constructorName = selector.name;
     Element result = localLookup(constructorName);
     return validateConstructorLookupResults(selector, result, noMatch);
   }
 
@@ skipping 395 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }