Remove peeking from parseTypedef and parseClassOrNamedMixinApplication.

pkg/front_end/lib/src/fasta/parser/identifier_context.dart

Index: pkg/front_end/lib/src/fasta/parser/identifier_context.dart
diff --git a/pkg/front_end/lib/src/fasta/parser/identifier_context.dart b/pkg/front_end/lib/src/fasta/parser/identifier_context.dart
index 5908d9285d4823531609f01626fdf93a3f872272..a19c1ad27dbd69d6b7227d345b29a19020452030 100644
--- a/pkg/front_end/lib/src/fasta/parser/identifier_context.dart
+++ b/pkg/front_end/lib/src/fasta/parser/identifier_context.dart
@@ -95,17 +95,13 @@ class IdentifierContext {
   static const enumValueDeclaration =
       const IdentifierContext._('enumValueDeclaration', inDeclaration: true);
 
-  /// Identifier is the name being declared by a named mixin declaration (e.g.
-  /// `Foo` in `class Foo = X with Y;`).
-  static const namedMixinDeclaration = const IdentifierContext._(
-      'namedMixinDeclaration',
+  /// Identifier is the name being declared by a class declaration or a named
+  /// mixin application, for example, `Foo` in `class Foo = X with Y;`.
+  static const classOrNamedMixinDeclaration = const IdentifierContext._(
+      'classOrNamedMixinDeclaration',
       inDeclaration: true,
       isBuiltInIdentifierAllowed: false);
 
-  /// Identifier is the name being declared by a class declaration.
-  static const classDeclaration = const IdentifierContext._('classDeclaration',
-      inDeclaration: true, isBuiltInIdentifierAllowed: false);
-
   /// Identifier is the name of a type variable being declared (e.g. `Foo` in
   /// `class C<Foo extends num> {}`).
   static const typeVariableDeclaration = const IdentifierContext._(