[mojo-edk] Explicitly serialise HANDLEs into messages instead of PlatformHandles.

mojo/edk/system/ports_message.h

Index: mojo/edk/system/ports_message.h
diff --git a/mojo/edk/system/ports_message.h b/mojo/edk/system/ports_message.h
index e2e2e8369264aa3efba36bd8a7cd7ed7f7e88ef5..bbc8e7954b6f38db4fdb357604413668e54ee784 100644
--- a/mojo/edk/system/ports_message.h
+++ b/mojo/edk/system/ports_message.h
@@ -25,7 +25,6 @@ class PortsMessage : public ports::Message {
 
   ~PortsMessage() override;
 
-  PlatformHandle* handles() { return channel_message_->handles(); }
   size_t num_handles() const { return channel_message_->num_handles(); }
   bool has_handles() const { return channel_message_->has_handles(); }
 
@@ -33,6 +32,10 @@ class PortsMessage : public ports::Message {
     channel_message_->SetHandles(std::move(handles));
   }
 
+  ScopedPlatformHandleVectorPtr TakeHandles() {
+    return channel_message_->TakeHandles();
+  }
+
   Channel::MessagePtr TakeChannelMessage() {
     return std::move(channel_message_);
   }