Move ParseYieldExpression to ParserBase.

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index c9a77aa527c86c656f95fcad188da91db096053a..202c0b5b0f306feb1835609d2dfd8937ceaae086 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -419,6 +419,7 @@ class ParserTraits {
     // Return types for traversing functions.
     typedef Handle<String> Identifier;
     typedef v8::internal::Expression* Expression;
+    typedef Yield* YieldExpression;
     typedef v8::internal::FunctionLiteral* FunctionLiteral;
     typedef v8::internal::Literal* Literal;
     typedef ObjectLiteral::Property* ObjectLiteralProperty;
@@ -552,7 +553,6 @@ class ParserTraits {
       int function_token_position,
       FunctionLiteral::FunctionType type,
       bool* ok);
-  Expression* ParseYieldExpression(bool* ok);
   Expression* ParseConditionalExpression(bool accept_IN, bool* ok);
 
  private:
@@ -696,7 +696,6 @@ class Parser : public ParserBase<ParserTraits> {
   // Support for hamony block scoped bindings.
   Block* ParseScopedBlock(ZoneStringList* labels, bool* ok);
 
-  Expression* ParseYieldExpression(bool* ok);
   Expression* ParseConditionalExpression(bool accept_IN, bool* ok);
   Expression* ParseBinaryExpression(int prec, bool accept_IN, bool* ok);
   Expression* ParseUnaryExpression(bool* ok);