Remove useless ZoneScopes from Parser.

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 5f4c6863c7a3f7bc2a3914f33653ae722c0ad338..c3a7edfd9cbe46d8f7445fb631d551c06f23bd88 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -562,8 +562,7 @@ class Parser BASE_EMBEDDED {
   };
 
   FunctionLiteral* ParseLazy();
-  FunctionLiteral* ParseLazy(Utf16CharacterStream* source,
-                             ZoneScope* zone_scope);
+  FunctionLiteral* ParseLazy(Utf16CharacterStream* source);
 
   Isolate* isolate() { return isolate_; }
   Zone* zone() const { return zone_; }
@@ -571,8 +570,7 @@ class Parser BASE_EMBEDDED {
 
   // Called by ParseProgram after setting up the scanner.
   FunctionLiteral* DoParseProgram(CompilationInfo* info,
-                                  Handle<String> source,
-                                  ZoneScope* zone_scope);
+                                  Handle<String> source);
 
   // Report syntax error
   void ReportUnexpectedToken(Token::Value token);