Revert "Add support for metadata on type variables to Fasta parser."

pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart

Index: pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart b/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
index 857220999f4a2342aa7fd6cc437b38556504afc3..74b633ec3ae0e4e184c4618bef5e3d1612f591ed 100644
--- a/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
+++ b/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
@@ -162,17 +162,6 @@ class AstBuilder extends ScopeListener {
     push(ast.methodInvocation(null, null, null, null, arguments));
   }
 
-  void endMetadata(Token beginToken, Token periodBeforeName, Token endToken) {
-    debugEvent("Metadata");
-    ArgumentList arguments = pop();
-    SimpleIdentifier constructorName = popIfNotNull(periodBeforeName);
-    var typeArguments = pop();
-    assert(typeArguments == null); // TODO(paulberry)
-    Identifier name = pop();
-    push(ast.annotation(toAnalyzerToken(beginToken), name,
-        toAnalyzerToken(periodBeforeName), constructorName, arguments));
-  }
-
   void handleIdentifier(Token token, IdentifierContext context) {
     debugEvent("handleIdentifier");
     analyzer.Token analyzerToken = toAnalyzerToken(token);
@@ -1276,8 +1265,9 @@ class AstBuilder extends ScopeListener {
     debugEvent("TypeVariable");
     TypeAnnotation bound = pop();
     SimpleIdentifier name = pop();
-    List<Annotation> metadata = pop();
-    Comment comment = pop();
+    List<Annotation> metadata = null; // TODO(paulberry)
+    // TODO(paulberry): capture doc comments.  See dartbug.com/28851.
+    Comment comment = null;
     push(ast.typeParameter(
         comment, metadata, name, toAnalyzerToken(extendsOrSuper), bound));
   }