Implement identity hashes for proxies.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 7355cd61c57f20a3ac0801e83ab288a66d7e3ef3..6db8f9845377c80579f521403b6fbf5aabef617c 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -3205,7 +3205,7 @@ bool v8::Object::SetHiddenValue(v8::Handle<v8::String> key,
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> hidden_props(i::GetHiddenProperties(
       self,
-      i::JSObject::ALLOW_CREATION));
+      i::ALLOW_CREATION));
   i::Handle<i::Object> key_obj = Utils::OpenHandle(*key);
   i::Handle<i::Object> value_obj = Utils::OpenHandle(*value);
   EXCEPTION_PREAMBLE(isolate);
@@ -3229,7 +3229,7 @@ v8::Local<v8::Value> v8::Object::GetHiddenValue(v8::Handle<v8::String> key) {
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> hidden_props(i::GetHiddenProperties(
       self,
-      i::JSObject::OMIT_CREATION));
+      i::OMIT_CREATION));
   if (hidden_props->IsUndefined()) {
     return v8::Local<v8::Value>();
   }
@@ -3253,7 +3253,7 @@ bool v8::Object::DeleteHiddenValue(v8::Handle<v8::String> key) {
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::Object> hidden_props(i::GetHiddenProperties(
       self,
-      i::JSObject::OMIT_CREATION));
+      i::OMIT_CREATION));
   if (hidden_props->IsUndefined()) {
     return true;
   }