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..f4dd4916ce6cdce4ca013c182c70381809feaa26 100644
--- a/chrome/browser/media/router/media_router_mojo_impl.cc
+++ b/chrome/browser/media/router/media_router_mojo_impl.cc
@@ -730,11 +730,6 @@ void MediaRouterMojoImpl::OnRouteMessagesReceived(
 
 void MediaRouterMojoImpl::OnSinkAvailabilityUpdated(
     SinkAvailability availability) {
-  if (!interfaces::MediaRouter::SinkAvailability_IsValidValue(availability)) {
-    DLOG(WARNING) << "Unknown SinkAvailability value " << availability;
-    return;
-  }
-
   if (availability_ == availability)
     return;
 
@@ -759,12 +754,6 @@ void MediaRouterMojoImpl::OnSinkAvailabilityUpdated(
 void MediaRouterMojoImpl::OnPresentationConnectionStateChanged(
     const mojo::String& route_id,
     interfaces::MediaRouter::PresentationConnectionState state) {
-  if (!interfaces::MediaRouter::PresentationConnectionState_IsValidValue(
-          state)) {
-    DLOG(WARNING) << "Unknown PresentationConnectionState value " << state;
-    return;
-  }
-
   NotifyPresentationConnectionStateChange(
       route_id, mojo::PresentationConnectionStateFromMojo(state));
 }