[mojo-edk] Minor clean-up in the ports layer

mojo/edk/system/ports/event.h

Index: mojo/edk/system/ports/event.h
diff --git a/mojo/edk/system/ports/event.h b/mojo/edk/system/ports/event.h
index aec9f6b43b98f26c1f425b4235edc1ceb30d4374..62bcdc2d06f0034be84710f7dd44950fb0cc64e7 100644
--- a/mojo/edk/system/ports/event.h
+++ b/mojo/edk/system/ports/event.h
@@ -9,15 +9,15 @@
 
 #include "mojo/edk/system/ports/message.h"
 #include "mojo/edk/system/ports/name.h"
-#include "mojo/public/c/system/macros.h"
 
 namespace mojo {
 namespace edk {
 namespace ports {
 
-// TODO: Add static assertions of alignment.
+struct PortDescriptor {
+  PortDescriptor();
+  ~PortDescriptor();
 
-struct MOJO_ALIGNAS(8) PortDescriptor {
   NodeName peer_node_name;
   PortName peer_port_name;
   NodeName referring_node_name;
@@ -26,9 +26,12 @@ struct MOJO_ALIGNAS(8) PortDescriptor {
   uint64_t next_sequence_num_to_receive;
   uint64_t last_sequence_num_to_receive;
   bool peer_closed;
+  uint8_t padding0;
+  uint16_t padding1;
+  uint32_t padding2;
 };
 
-enum struct EventType : uint32_t {
+enum EventType : uint32_t {
   kUser,
   kPortAccepted,
   kObserveProxy,