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

media/base/serial_runner.cc

Index: media/base/serial_runner.cc
diff --git a/media/base/serial_runner.cc b/media/base/serial_runner.cc
index 6cb89cbeabadfd11e373bad5bbc6232f97e7d8cf..bbade4af852713fe40b5bbdbb9c50d8b1af97049 100644
--- a/media/base/serial_runner.cc
+++ b/media/base/serial_runner.cc
@@ -88,9 +88,10 @@ SerialRunner::SerialRunner(const Queue& bound_fns,
 
 SerialRunner::~SerialRunner() {}
 
-scoped_ptr<SerialRunner> SerialRunner::Run(
-    const Queue& bound_fns, const PipelineStatusCB& done_cb) {
-  scoped_ptr<SerialRunner> callback_series(
+std::unique_ptr<SerialRunner> SerialRunner::Run(
+    const Queue& bound_fns,
+    const PipelineStatusCB& done_cb) {
+  std::unique_ptr<SerialRunner> callback_series(
       new SerialRunner(bound_fns, done_cb));
   return callback_series;
 }