Stop using with explicitly to implement try/catch.

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index a7132ce240a3c3650801102438adf4781844cc76..fe11bc9b5114c20eec6a54857ac382a29ad78b56 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -498,10 +498,7 @@ class Parser {
   Statement* ParseContinueStatement(bool* ok);
   Statement* ParseBreakStatement(ZoneStringList* labels, bool* ok);
   Statement* ParseReturnStatement(bool* ok);
-  Block* WithHelper(Expression* obj,
-                    ZoneStringList* labels,
-                    bool is_catch_block,
-                    bool* ok);
+  Block* WithHelper(Expression* obj, ZoneStringList* labels, bool* ok);
   Statement* ParseWithStatement(ZoneStringList* labels, bool* ok);
   CaseClause* ParseCaseClause(bool* default_seen_ptr, bool* ok);
   SwitchStatement* ParseSwitchStatement(ZoneStringList* labels, bool* ok);