Remove unused API.

dart/sdk/lib/_internal/compiler/implementation/js/nodes.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 js;
 
 abstract class NodeVisitor<T> {
   T visitProgram(Program node);
 
   T visitBlock(Block node);
@@ skipping 463 matching lines @@
     if (expression == null) {
       arguments = <Expression>[];
     } else if (expression is List) {
       arguments = expression.map(js.toExpression).toList();
     } else {
       arguments = <Expression>[js.toExpression(expression)];
     }
     return callWith(arguments);
   }
 
-  Expression equals(expression) => binary('==', expression);
-
-  Expression strictEquals(expression) => binary('===', expression);
-
-  Expression notEquals(expression) => binary('!=', expression);
-
   Expression operator +(expression) => binary('+', expression);
 
   Expression operator -(expression) => binary('-', expression);
 
   Expression operator &(expression) => binary('&', expression);
 
   Expression operator <(expression) => binary('<', expression);
 
   Expression operator >(expression) => binary('>', expression);
 
   Expression operator >=(expression) => binary('>=', expression);
 
   Expression binary(String operator, expression) {
     return new Binary(operator, this, js.toExpression(expression));
   }
 
-  Expression assign(expression) {
-    return new Assignment(this, js.toExpression(expression));
-  }
-
   Expression update(String operator, expression) {
     return new Assignment.compound(this, operator, js.toExpression(expression));
   }
 
   Expression get plusPlus => new Postfix('++', this);
 
   Prefix get typeof => new Prefix('typeof', this);
 
   Prefix get not => new Prefix('!', this);
 }
@@ skipping 496 matching lines @@
  */
 class Comment extends Statement {
   final String comment;
 
   Comment(this.comment);
 
   accept(NodeVisitor visitor) => visitor.visitComment(this);
 
   void visitChildren(NodeVisitor visitor) {}
 }