Move common URIs to common/names.dart

pkg/compiler/lib/src/dart_backend/renamer.dart

 // Copyright (c) 2012, 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 dart_backend;
 
 Comparator get _compareNodes =>
     compareBy((n) => n.getBeginToken().charOffset);
 
 abstract class Renamable implements Comparable {
@@ skipping 128 matching lines @@
            Elements.isStaticOrTopLevel(entity) ||
            entity is TypeVariableElement);
     // TODO(smok): We may want to reuse class static field and method names.
     if (entity is Element) {
       LibraryElement library = entity.library;
       if (reexportingLibraries.containsKey(entity)) {
         library = reexportingLibraries[entity];
       }
       if (library.isPlatformLibrary) {
         // TODO(johnniwinther): Handle prefixes for dart:core.
-        if (library.canonicalUri == Compiler.DART_CORE) return entity.name;
+        if (library.canonicalUri == Uris.dart_core) return entity.name;
         if (library.isInternalLibrary) {
           throw new SpannableAssertionFailure(entity,
               "Internal library $library should never have been imported from "
               "the code compiled by dart2dart.");
         }
 
         String prefix = platformImports.putIfAbsent(library, () => null);
         if (entity.isTopLevel &&
             fixedDynamicNames.contains(entity.name)) {
           if (prefix == null) {
@@ skipping 206 matching lines @@
   MinifyingGenerator();
 
   String generate(String originalName, bool isForbidden(String name)) {
     String result;
     do {
       result = generateMiniId(index++);
     } while (isForbidden(result));
     return result;
   }
 }