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

media/base/user_input_monitor.cc

Index: media/base/user_input_monitor.cc
diff --git a/media/base/user_input_monitor.cc b/media/base/user_input_monitor.cc
index 105afb3935ce08511f691ce05db884ccfafd9fae..60ab0b675cb9cbf4513e1f2ccaf3c9a33d0c250c 100644
--- a/media/base/user_input_monitor.cc
+++ b/media/base/user_input_monitor.cc
@@ -9,10 +9,10 @@
 namespace media {
 
 #ifdef DISABLE_USER_INPUT_MONITOR
-scoped_ptr<UserInputMonitor> UserInputMonitor::Create(
+std::unique_ptr<UserInputMonitor> UserInputMonitor::Create(
     const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
     const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner) {
-  return scoped_ptr<UserInputMonitor>();
+  return nullptr;
 }
 #endif  // DISABLE_USER_INPUT_MONITOR