Move common identifiers, names and selectors to a separate library.

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;
 import '../compiler.dart' show
     Compiler,
     isPrivateName;
 import '../dart_types.dart' show
     DartType,
     InterfaceType,
     FunctionType;
 import '../util/util.dart' show
     Link;
 
@@ skipping 407 matching lines @@
     // Use [declaration] for both [this] and [cls], because
     // declaration classes hold the superclass hierarchy.
     cls = cls.declaration;
     for (ClassElement s = declaration; s != null; s = s.superclass) {
       if (identical(s, cls)) return true;
     }
     return false;
   }
 
   FunctionType get callType {
-    MemberSignature member =
-        lookupInterfaceMember(const PublicName(Compiler.CALL_OPERATOR_NAME));
+    MemberSignature member = lookupInterfaceMember(Names.call);
     return member != null && member.isMethod ? member.type : null;
   }
 }
 
 abstract class FunctionSignatureCommon implements FunctionSignature {
   void forEachRequiredParameter(void function(Element parameter)) {
     requiredParameters.forEach(function);
   }
 
   void forEachOptionalParameter(void function(Element parameter)) {
@@ skipping 43 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;
   }
 }