Revert of [Extensions] Finish freezing schema

extensions/renderer/v8_schema_registry.cc

Index: extensions/renderer/v8_schema_registry.cc
diff --git a/extensions/renderer/v8_schema_registry.cc b/extensions/renderer/v8_schema_registry.cc
index 3bd7c4791223b34fde1dcb077697f7b9a25b002a..851b01171413853e7bbac99df035d2884ab325dd 100644
--- a/extensions/renderer/v8_schema_registry.cc
+++ b/extensions/renderer/v8_schema_registry.cc
@@ -20,22 +20,6 @@
 namespace extensions {
 
 namespace {
-
-// Recursively freezes every v8 object on |object|.
-void DeepFreeze(const v8::Local<v8::Object>& object,
-                const v8::Local<v8::Context>& context) {
-  // Don't let the object trace upwards via the prototype.
-  v8::Maybe<bool> maybe =
-      object->SetPrototype(context, v8::Null(context->GetIsolate()));
-  CHECK(maybe.IsJust() && maybe.FromJust());
-  v8::Local<v8::Array> property_names = object->GetOwnPropertyNames();
-  for (uint32_t i = 0; i < property_names->Length(); ++i) {
-    v8::Local<v8::Value> child = object->Get(property_names->Get(i));
-    if (child->IsObject())
-      DeepFreeze(v8::Local<v8::Object>::Cast(child), context);
-  }
-  object->SetIntegrityLevel(context, v8::IntegrityLevel::kFrozen);
-}
 
 class SchemaRegistryNativeHandler : public ObjectBackedNativeHandler {
  public:
@@ -120,7 +104,7 @@
   CHECK(!value.IsEmpty());
 
   v8::Local<v8::Object> v8_schema(v8::Local<v8::Object>::Cast(value));
-  DeepFreeze(v8_schema, context);
+  v8_schema->SetIntegrityLevel(context, v8::IntegrityLevel::kFrozen);
   schema_cache_->Set(api, v8_schema);
 
   return handle_scope.Escape(v8_schema);