Change mojo enums to be scoped enums in the generated C++ bindings.

media/mojo/services/mojo_cdm_service.cc

Index: media/mojo/services/mojo_cdm_service.cc
diff --git a/media/mojo/services/mojo_cdm_service.cc b/media/mojo/services/mojo_cdm_service.cc
index 52bfee2fdecbdb999eefb6d2318ca433d9b93713..9a8f2702c753d0636758e219f9ab68eb0843d4e6 100644
--- a/media/mojo/services/mojo_cdm_service.cc
+++ b/media/mojo/services/mojo_cdm_service.cc
@@ -194,7 +194,7 @@ void MojoCdmService::OnCdmCreated(const InitializeCallback& callback,
   if (!cdm || !context_) {
     cdm_promise_result->success = false;
     cdm_promise_result->exception =
-        interfaces::CDM_EXCEPTION_NOT_SUPPORTED_ERROR;
+        interfaces::CdmException::NOT_SUPPORTED_ERROR;
     cdm_promise_result->system_code = 0;
     cdm_promise_result->error_message = error_message;
     callback.Run(std::move(cdm_promise_result), 0, nullptr);