[parser] Refactor of ParseFunctionDeclaration

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index 689d4c2a562719f7728394260cf04c2989738b34..a37aa04436b818c2604913c441ded1dc2967cca3 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -837,9 +837,6 @@ class PreParser : public ParserBase<PreParser> {
   // which is set to false if parsing failed; it is unchanged otherwise.
   // By making the 'exception handling' explicit, we are forced to check
   // for failure at the call sites.
-  Statement ParseFunctionDeclaration(bool* ok);
-  Expression ParseConditionalExpression(bool accept_IN, bool* ok);
-  Expression ParseObjectLiteral(bool* ok);
 
   V8_INLINE PreParserStatementList ParseEagerFunctionBody(
       PreParserIdentifier function_name, int pos,