dart2js: Sort libraries by Uri only.

pkg/compiler/lib/src/elements/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.
 
 /// Mixins that implement convenience methods on [Element] subclasses.
 
 library elements.common;
 
 import '../common/names.dart' show Identifiers, Names, Uris;
 import '../core_types.dart' show CoreClasses;
@@ skipping 164 matching lines @@
 
   String get libraryOrScriptName {
     if (hasLibraryName) {
       return libraryName;
     } else {
       // Use the file name as script name.
       String path = canonicalUri.path;
       return path.substring(path.lastIndexOf('/') + 1);
     }
   }
-
-  int compareTo(LibraryElement other) {
-    if (this == other) return 0;
-    return libraryOrScriptName.compareTo(other.libraryOrScriptName);
-  }
 }
 
 abstract class CompilationUnitElementCommon implements CompilationUnitElement {
-  int compareTo(CompilationUnitElement other) {
-    if (this == other) return 0;
-    return '${script.readableUri}'.compareTo('${other.script.readableUri}');
-  }
 }
 
 abstract class ClassElementCommon implements ClassElement {
   @override
   Link<DartType> get allSupertypes => allSupertypesAndSelf.supertypes;
 
   @override
   int get hierarchyDepth => allSupertypesAndSelf.maxDepth;
 
   @override
@@ skipping 438 matching lines @@
   @override
   bool get isBoolFromEnvironmentConstructor {
     return fromEnvironmentState == _FromEnvironmentState.BOOL;
   }
 
   @override
   bool get isStringFromEnvironmentConstructor {
     return fromEnvironmentState == _FromEnvironmentState.STRING;
   }
 }