Use std::default_delete as the default deleter for scoped_ptr.

media/base/serial_runner.h

Index: media/base/serial_runner.h
diff --git a/media/base/serial_runner.h b/media/base/serial_runner.h
index 9750e212031095116da5024496cabca67c6ebfb9..fb1b66075346411559ed51ecc0e13877e676f39f 100644
--- a/media/base/serial_runner.h
+++ b/media/base/serial_runner.h
@@ -5,6 +5,7 @@
 #ifndef MEDIA_BASE_SERIAL_RUNNER_H_
 #define MEDIA_BASE_SERIAL_RUNNER_H_
 
+#include <memory>
 #include <queue>
 
 #include "base/callback.h"
@@ -65,7 +66,7 @@ class MEDIA_EXPORT SerialRunner {
       const Queue& bound_fns, const PipelineStatusCB& done_cb);
 
  private:
-  friend struct base::DefaultDeleter<SerialRunner>;
+  friend std::default_delete<SerialRunner>;
 
   SerialRunner(const Queue& bound_fns, const PipelineStatusCB& done_cb);
   ~SerialRunner();