dart2js: Sort libraries by Uri only.

pkg/compiler/lib/src/elements/common.dart

Index: pkg/compiler/lib/src/elements/common.dart
diff --git a/pkg/compiler/lib/src/elements/common.dart b/pkg/compiler/lib/src/elements/common.dart
index b3a43ca961082fe351a7f95daa874024f70dac95..7f5fbbbedd8a6c654ed6875075f2b78ea07eb76f 100644
--- a/pkg/compiler/lib/src/elements/common.dart
+++ b/pkg/compiler/lib/src/elements/common.dart
@@ -182,18 +182,9 @@ abstract class LibraryElementCommon implements LibraryElement {
       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 {