Move common URIs to common/names.dart

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
-    Names;
+    Names,
+    Uris;
 import '../compiler.dart' show
     Compiler,
     isPrivateName;
 import '../dart_types.dart' show
     DartType,
     InterfaceType,
     FunctionType;
 import '../util/util.dart' show
     Link;
 
@@ skipping 95 matching lines @@
   }
 
   @override
   Element get origin {
     throw new UnsupportedError('origin is not supported on $this');
   }
 }
 
 abstract class LibraryElementCommon implements LibraryElement {
   @override
-  bool get isDartCore => canonicalUri == Compiler.DART_CORE;
+  bool get isDartCore => canonicalUri == Uris.dart_core;
 
   @override
   bool get isPlatformLibrary => canonicalUri.scheme == 'dart';
 
   @override
   bool get isPackageLibrary => canonicalUri.scheme == 'package';
 
   @override
   bool get isInternalLibrary =>
       isPlatformLibrary && canonicalUri.path.startsWith('_');
@@ skipping 355 matching lines @@
       // this signature must not have more required parameters.  Having more
       // optional parameters is not a problem, they simply are never provided
       // by call sites of a call to a method with the other signature.
       int otherTotalCount = signature.parameterCount;
       return requiredParameterCount <= otherTotalCount
           && parameterCount >= otherTotalCount;
     }
     return true;
   }
 }