Clean up shared names.

pkg/front_end/lib/src/fasta/kernel/frontend_accessors.dart

 // Copyright (c) 2016, 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.
 
 /// A library to help transform compounds and null-aware accessors into
 /// let expressions.
 
 import 'package:front_end/src/fasta/kernel/kernel_shadow_ast.dart'
     show
         KernelArguments,
         KernelMethodInvocation,
         KernelPropertyGet,
         KernelPropertySet,
         KernelVariableGet,
         KernelVariableSet;
 
 import 'package:front_end/src/fasta/kernel/utils.dart' show offsetForToken;
 
 import 'package:front_end/src/scanner/token.dart' show Token;
 
 import 'package:front_end/src/fasta/kernel/fasta_accessors.dart'
     show BuilderHelper;
 
 import 'package:kernel/ast.dart' hide MethodInvocation;
 
-final Name indexGetName = new Name("[]");
-
-final Name indexSetName = new Name("[]=");
+import '../names.dart' show equalsName, indexGetName, indexSetName;
 
 /// An [Accessor] represents a subexpression for which we can't yet build a
 /// kernel [Expression] because we don't yet know the context in which it is
 /// used.
 ///
 /// Once the context is known, an [Accessor] can be converted into an
 /// [Expression] by calling a "build" method.
 ///
 /// For example, when building a kernel representation for `a[x] = b`, after
 /// parsing `a[x]` but before parsing `= b`, we don't yet know whether to
@@ skipping 477 matching lines @@
 }
 
 Expression makeBinary(
     Expression left, Name operator, Procedure interfaceTarget, Expression right,
     {int offset: TreeNode.noOffset}) {
   return new KernelMethodInvocation(
       left, operator, new KernelArguments(<Expression>[right]), interfaceTarget)
     ..fileOffset = offset;
 }
 
-final Name _equalOperator = new Name('==');
-
 Expression buildIsNull(Expression value, {int offset: TreeNode.noOffset}) {
-  return makeBinary(value, _equalOperator, null, new NullLiteral(),
-      offset: offset);
+  return makeBinary(value, equalsName, null, new NullLiteral(), offset: offset);
 }
 
 VariableDeclaration makeOrReuseVariable(Expression value) {
   // TODO: Devise a way to remember if a variable declaration was reused
   // or is fresh (hence needs a let binding).
   return new VariableDeclaration.forValue(value);
 }
 
 Expression wrapInvalid(Expression e) {
   return new Let(new VariableDeclaration.forValue(e), new InvalidExpression());
 }