Replace scoped_ptr with std::unique_ptr in //media/base.

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 3adfd64f730479e7b537b6b55c67a6e71f600040..e7b8a0c3ed2d276d94103c31f54fa766fd9e1922 100644
--- a/media/base/serial_runner.h
+++ b/media/base/serial_runner.h
@@ -11,7 +11,6 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "media/base/media_export.h"
 #include "media/base/pipeline_status.h"
@@ -64,8 +63,8 @@ class MEDIA_EXPORT SerialRunner {
   //
   // Deleting the object will prevent execution of any unstarted bound
   // functions, including |done_cb|.
-  static scoped_ptr<SerialRunner> Run(
-      const Queue& bound_fns, const PipelineStatusCB& done_cb);
+  static std::unique_ptr<SerialRunner> Run(const Queue& bound_fns,
+                                           const PipelineStatusCB& done_cb);
 
  private:
   friend std::default_delete<SerialRunner>;