Revert "Add optional message to assert in Dart2js - continued"

pkg/compiler/lib/src/tree/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 tree;
 
 abstract class Visitor<R> {
   const Visitor();
 
   R visitNode(Node node);
 
-  R visitAssert(Assert node) => visitStatement(node);
   R visitAsyncForIn(AsyncForIn node) => visitLoop(node);
   R visitAsyncModifier(AsyncModifier node) => visitNode(node);
   R visitAwait(Await node) => visitExpression(node);
   R visitBlock(Block node) => visitStatement(node);
   R visitBreakStatement(BreakStatement node) => visitGotoStatement(node);
   R visitCascade(Cascade node) => visitExpression(node);
   R visitCascadeReceiver(CascadeReceiver node) => visitExpression(node);
   R visitCaseMatch(CaseMatch node) => visitNode(node);
   R visitCatchBlock(CatchBlock node) => visitNode(node);
   R visitClassNode(ClassNode node) => visitNode(node);
@@ skipping 117 matching lines @@
   toDebugString() {
     return PrettyPrinter.prettyPrint(this);
   }
 
   String getObjectDescription() => super.toString();
 
   Token getBeginToken();
 
   Token getEndToken();
 
-  Assert asAssert() => null;
   AsyncModifier asAsyncModifier() => null;
   Await asAwait() => null;
   Block asBlock() => null;
   BreakStatement asBreakStatement() => null;
   Cascade asCascade() => null;
   CascadeReceiver asCascadeReceiver() => null;
   CaseMatch asCaseMatch() => null;
   CatchBlock asCatchBlock() => null;
   ClassNode asClassNode() => null;
   Combinator asCombinator() => null;
@@ skipping 1045 matching lines @@
 
   visitChildren(Visitor visitor) {
     expression.accept(visitor);
   }
 
   Token getBeginToken() => awaitToken;
 
   Token getEndToken() => expression.getEndToken();
 }
 
-class Assert extends Statement {
-  final Token assertToken;
-  final Expression condition;
-  /** Message may be `null`. */
-  final Expression message;
-  final Token semicolonToken;
-
-  Assert(this.assertToken, this.condition, this.message, this.semicolonToken);
-
-  Assert asAssert() => this;
-
-  bool get hasMessage => message != null;
-
-  accept(Visitor visitor) => visitor.visitAssert(this);
-
-  visitChildren(Visitor visitor) {
-    condition.accept(visitor);
-    if (message != null) message.accept(visitor);
-  }
-
-  Token getBeginToken() => assertToken;
-  Token getEndToken() => semicolonToken;
-}
-
 class Rethrow extends Statement {
   final Token throwToken;
   final Token endToken;
 
   Rethrow(this.throwToken, this.endToken);
 
   Rethrow asRethrow() => this;
 
   accept(Visitor visitor) => visitor.visitRethrow(this);
   visitChildren(Visitor visitor) { }
@@ skipping 1123 matching lines @@
 
   // VariableDefinitions.
   get metadata => null;
   get type => null;
 
   // Typedef.
   get typeParameters => null;
   get formals => null;
   get typedefKeyword => null;
 }