Remove peeking from parseTypedef and parseClassOrNamedMixinApplication.

pkg/front_end/lib/src/fasta/parser/parser.md

 <!--
 Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 for details. All rights reserved. Use of this source code is governed by a
 BSD-style license that can be found in the LICENSE file.
 -->
 
 # Uses of peek in the parser
 
-  * In parseTypedef, the parser uses peekAfterNominalType to select between old
-    style and new style.
-
-  * In parseClassOrNamedMixinApplication, the parser uses peekAfterNominalType
-    to select between named mixin application or class declaration.
-
   * In parseClass, the parser uses peekAfterNominalType to select between a
     mixin application and a regular extends.
 
   * In parseType, the parser uses peekAfterIfType to tell the difference
     between `id` and `id id`.
 
   * In parseExpressionStatementOrDeclaration, the parser uses
     peekIdentifierAfterType to select between an expression statement or a
     local (function or variable) declaration.
 
   * In parseExpressionStatementOrConstDeclaration, the parser uses
     peekIdentifierAfterOptionalType to select between an expression statement
     and a const local variable.
 
   * In parseSendOrFunctionLiteral, the parser uses peekAfterIfType to select
     between function expression and send.
 
   * In parseVariablesDeclarationOrExpressionOpt, the parser uses
     peekIdentifierAfterType to select between local variable declarations or an
     expression.
 
   * In parseSwitchCase, the parser uses peekPastLabels to select between case
     labels and statement labels.
 
   * The parser uses isGeneralizedFunctionType in parseType, and findMemberName.
 
   * The parser uses findMemberName in parseTopLevelMember, and parseMember.