Mojo C++ bindings: support enum validation.

chrome/browser/media/router/media_router_mojo_impl.cc

Index: chrome/browser/media/router/media_router_mojo_impl.cc
diff --git a/chrome/browser/media/router/media_router_mojo_impl.cc b/chrome/browser/media/router/media_router_mojo_impl.cc
index bd9f6acaf0dfa5f8d12b87949da2c03989b75163..fc9bd4babd456037a58babd56d48dde0ce27097e 100644
--- a/chrome/browser/media/router/media_router_mojo_impl.cc
+++ b/chrome/browser/media/router/media_router_mojo_impl.cc
@@ -730,7 +730,7 @@ void MediaRouterMojoImpl::OnRouteMessagesReceived(
 
 void MediaRouterMojoImpl::OnSinkAvailabilityUpdated(
     SinkAvailability availability) {
-  if (!interfaces::MediaRouter::SinkAvailability_IsValidValue(availability)) {
+  if (!IsKnownEnumValue(availability)) {
     DLOG(WARNING) << "Unknown SinkAvailability value " << availability;
     return;
   }
@@ -759,8 +759,7 @@ void MediaRouterMojoImpl::OnSinkAvailabilityUpdated(
 void MediaRouterMojoImpl::OnPresentationConnectionStateChanged(
     const mojo::String& route_id,
     interfaces::MediaRouter::PresentationConnectionState state) {
-  if (!interfaces::MediaRouter::PresentationConnectionState_IsValidValue(
-          state)) {
+  if (!IsKnownEnumValue(state)) {
     DLOG(WARNING) << "Unknown PresentationConnectionState value " << state;
     return;
   }