Revert "Add support for the new function-type syntax."

pkg/compiler/lib/src/native/behavior.dart

Index: pkg/compiler/lib/src/native/behavior.dart
diff --git a/pkg/compiler/lib/src/native/behavior.dart b/pkg/compiler/lib/src/native/behavior.dart
index 90db068372a34b56777f46af1b9fbd21b944de00..28e7215e616c22c88a9d1caa523a449e4fe77abf 100644
--- a/pkg/compiler/lib/src/native/behavior.dart
+++ b/pkg/compiler/lib/src/native/behavior.dart
@@ -262,7 +262,7 @@ class NativeBehavior {
   ///    Each tag kind (including the 'type-tag's) can only occur once in the
   ///    sequence.
   ///
-  /// [specString] is the specification string, [lookupType] resolves named
+  /// [specString] is the specification string, [resolveType] resolves named
   /// types into type values, [typesReturned] and [typesInstantiated] collects
   /// the types defined by the specification string, and [objectType] and
   /// [nullType] define the types for `Object` and `Null`, respectively. The