[Extensions] Don't allow gin::Define to be overridden

extensions/renderer/module_system.cc

Index: extensions/renderer/module_system.cc
diff --git a/extensions/renderer/module_system.cc b/extensions/renderer/module_system.cc
index 3e3da6a1b7af4d116bcccba8c4cc69c238cf89a5..e84f0e072a133a9ef7b3d080470731ee8f1ad8a7 100644
--- a/extensions/renderer/module_system.cc
+++ b/extensions/renderer/module_system.cc
@@ -101,8 +101,8 @@ class DefaultExceptionHandler : public ModuleSystem::ExceptionHandler {
 void SetExportsProperty(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   v8::Local<v8::Object> obj = args.This();
-  DCHECK_EQ(2, args.Length());
-  DCHECK(args[0]->IsString());
+  CHECK_EQ(2, args.Length());
+  CHECK(args[0]->IsString());
   v8::Maybe<bool> result =
       obj->DefineOwnProperty(args.GetIsolate()->GetCurrentContext(),
                              args[0]->ToString(), args[1], v8::ReadOnly);