Revert the previous clang-format changes to pass the clang format check

on github.

src/core/ext/filters/client_channel/backup_poller.cc

@@ -16,12 +16,13 @@
  *
  */
 
+#include <grpc/support/port_platform.h>
+
 #include "src/core/ext/filters/client_channel/backup_poller.h"
 
 #include <grpc/grpc.h>
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
-#include <grpc/support/port_platform.h>
 #include <grpc/support/sync.h>
 
 #include "src/core/ext/filters/client_channel/client_channel.h"