Bug 1053204 - remove redundant close() r=bent

netwerk/ipc/RemoteOpenFileParent.cpp

@@ -55,12 +55,7 @@ RemoteOpenFileParent::OpenSendCloseDelete()
   // Sending a potentially invalid file descriptor is just fine.
   unused << Send__delete__(this, fileDescriptor);
 
-  if (fileDescriptor.IsValid()) {
-    // close file now that other process has it open, else we'll leak fds in the
-    // parent process.
-    close(fileDescriptor.PlatformHandle());
-  }
-
+  // Current process's file descriptor is closed by FileDescriptor destructor.
 #endif // OS_TYPE
 
   return true;