fix all instances of "the the"

pkg/compiler/lib/src/resolution/class_hierarchy.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.
 
 library dart2js.resolution.class_hierarchy;
 
 import '../common.dart';
 import '../common/resolution.dart' show Feature;
 import '../compiler.dart' show Compiler;
 import '../core_types.dart' show CoreClasses, CoreTypes;
@@ skipping 230 matching lines @@
       reporter.reportErrorMessage(
           node, MessageKind.EMPTY_ENUM_DECLARATION, {'enumName': element.name});
     }
 
     EnumCreator creator =
         new EnumCreator(reporter, compiler.coreTypes, element);
     creator.createMembers();
     return enumType;
   }
 
-  /// Resolves the mixed type for [mixinNode] and checks that the the mixin type
+  /// Resolves the mixed type for [mixinNode] and checks that the mixin type
   /// is a valid, non-blacklisted interface type. The mixin type is returned.
   DartType checkMixinType(TypeAnnotation mixinNode) {
     DartType mixinType = resolveType(mixinNode);
     if (isBlackListed(mixinType)) {
       reporter.reportErrorMessage(
           mixinNode, MessageKind.CANNOT_MIXIN, {'type': mixinType});
     } else if (mixinType.isTypeVariable) {
       reporter.reportErrorMessage(mixinNode, MessageKind.CLASS_NAME_EXPECTED);
     } else if (mixinType.isMalformed) {
       reporter.reportErrorMessage(mixinNode, MessageKind.CANNOT_MIXIN_MALFORMED,
@@ skipping 386 matching lines @@
     Identifier selector = node.selector.asIdentifier();
     var e = prefixElement.lookupLocalMember(selector.source);
     if (e == null || !e.impliesType) {
       reporter.reportErrorMessage(node.selector,
           MessageKind.CANNOT_RESOLVE_TYPE, {'typeName': node.selector});
       return;
     }
     loadSupertype(e, node);
   }
 }