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

pkg/compiler/lib/src/resolution/send_structure.dart

Index: pkg/compiler/lib/src/resolution/send_structure.dart
diff --git a/pkg/compiler/lib/src/resolution/send_structure.dart b/pkg/compiler/lib/src/resolution/send_structure.dart
index a427db9df015cfff3274a212e9d78111f40e4028..6cef7eb06bbd1ba5366e2992a14951b04cb944b5 100644
--- a/pkg/compiler/lib/src/resolution/send_structure.dart
+++ b/pkg/compiler/lib/src/resolution/send_structure.dart
@@ -35,6 +35,35 @@ abstract class SendStructure<R, A> extends SemanticSendStructure<R, A> {
   R dispatch(SemanticSendVisitor<R, A> visitor, Send send, A arg);
 }
 
+/// The structure for a [Send] of the form `assert(e)`.
+class AssertStructure<R, A> implements SendStructure<R, A> {
+  const AssertStructure();
+
+  R dispatch(SemanticSendVisitor<R, A> visitor, Send node, A arg) {
+    return visitor.visitAssert(
+        node,
+        node.arguments.single,
+        arg);
+  }
+
+  String toString() => 'assert';
+}
+
+/// The structure for a [Send] of the form an `assert` with less or more than
+/// one argument.
+class InvalidAssertStructure<R, A> implements SendStructure<R, A> {
+  const InvalidAssertStructure();
+
+  R dispatch(SemanticSendVisitor<R, A> visitor, Send node, A arg) {
+    return visitor.errorInvalidAssert(
+        node,
+        node.argumentsNode,
+        arg);
+  }
+
+  String toString() => 'invalid assert';
+}
+
 /// The structure for a [Send] of the form `a ?? b`.
 class IfNullStructure<R, A> implements SendStructure<R, A> {
   const IfNullStructure();