Move common URIs to common/names.dart

pkg/compiler/lib/src/library_loader.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.
 
 library dart2js.library_loader;
 
 import 'dart:async';
 
+import 'common/names.dart' show
+    Uris;
 import 'common/tasks.dart' show
     CompilerTask;
 import 'compiler.dart' show
     Compiler;
 import 'diagnostics/diagnostic_listener.dart';
 import 'diagnostics/invariant.dart' show
     invariant;
 import 'diagnostics/messages.dart' show
     MessageKind;
 import 'elements/elements.dart' show
@@ skipping 385 matching lines @@
           compiler.internalError(tag, "Unhandled library tag.");
         }
       });
     }).then((_) {
       return compiler.onLibraryScanned(library, handler);
     }).then((_) {
       return compiler.withCurrentElement(library, () {
         checkDuplicatedLibraryName(library);
 
         // Import dart:core if not already imported.
-        if (!importsDartCore && library.canonicalUri != Compiler.DART_CORE) {
-          return createLibrary(handler, null, Compiler.DART_CORE)
+        if (!importsDartCore && library.canonicalUri != Uris.dart_core) {
+          return createLibrary(handler, null, Uris.dart_core)
               .then((LibraryElement coreLibrary) {
             handler.registerDependency(library, null, coreLibrary);
           });
         }
       });
     }).then((_) {
       return Future.forEach(libraryDependencies.toList(), (tag) {
         return compiler.withCurrentElement(library, () {
           return registerLibraryFromTag(handler, library, tag);
         });
@@ skipping 788 matching lines @@
         }
         suffixes.add(const Link<Uri>().prepend(canonicalUri));
       }
       suffixChainMap[library] = suffixes;
       return;
     }
 
     computeSuffixes(rootLibrary, const Link<Uri>());
   }
 }