Addressed CR feedback.

src/compiler/checker.ts

@@ -7110,9 +7110,7 @@ namespace ts {
                 switch (expr.kind) {
                     case SyntaxKind.Identifier:
                     case SyntaxKind.PropertyAccessExpression:
-                    case SyntaxKind.QualifiedName:
-                        // TODO (drosen): Why a qualified name?
-                        return getSymbolOfEntityNameOrPropertyAccessExpression(expr as Node as (EntityName | PropertyAccessExpression));
+                        return getSymbolOfEntityNameOrPropertyAccessExpression(expr as (Identifier | PropertyAccessExpression));
                 }
             }
 

src/compiler/parser.ts

@@ -1937,7 +1937,7 @@ namespace ts {
             return finishNode(node);
         }
 
-        function parseThisTypePredicate(lhs: Identifier | ThisTypeNode): TypePredicateNode {
+        function parseThisTypePredicate(lhs: ThisTypeNode): TypePredicateNode {
             nextToken();
             const node = createNode(SyntaxKind.TypePredicate, lhs.pos) as TypePredicateNode;
             node.parameterName = lhs;