Remove the dependency of Zone on Isolate

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index 26190b832874835b8553c695a4c4aabe44d3aeca..8540a159d7e4714fe8e9bd7a48a4b1d201c21513 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -223,10 +223,11 @@ class RegExpBuilder: public ZoneObject {
 class RegExpParser BASE_EMBEDDED {
  public:
   RegExpParser(FlatStringReader* in, Handle<String>* error, bool multiline_mode,
-               bool unicode, Zone* zone);
+               bool unicode, Isolate* isolate, Zone* zone);
 
-  static bool ParseRegExp(FlatStringReader* input, bool multiline, bool unicode,
-                          RegExpCompileData* result, Zone* zone);
+  static bool ParseRegExp(Isolate* isolate, Zone* zone, FlatStringReader* input,
+                          bool multiline, bool unicode,
+                          RegExpCompileData* result);
 
   RegExpTree* ParsePattern();
   RegExpTree* ParseDisjunction();