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

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

Index: pkg/compiler/lib/src/resolution/resolution_result.dart
diff --git a/pkg/compiler/lib/src/resolution/resolution_result.dart b/pkg/compiler/lib/src/resolution/resolution_result.dart
index 6168025a7743f5de445d220c668d91d480f65bd7..91d7c62b6696e12f1cea6fe168e7a7753be2088f 100644
--- a/pkg/compiler/lib/src/resolution/resolution_result.dart
+++ b/pkg/compiler/lib/src/resolution/resolution_result.dart
@@ -83,6 +83,15 @@ class TypeResult extends ResolutionResult {
   String toString() => 'TypeResult($type)';
 }
 
+/// The result for the resolution of the `assert` method.
+class AssertResult extends ResolutionResult {
+  const AssertResult();
+
+  ResultKind get kind => ResultKind.ASSERT;
+
+  String toString() => 'AssertResult()';
+}
+
 /// The result for resolving a constant expression.
 class ConstantResult extends ResolutionResult {
   final Node node;
@@ -134,4 +143,4 @@ class ArgumentsResult {
       return result.constant;
     }).toList();
   }
-}
+}