Replace scoped_ptr with unique_ptr in webrtc/base/

webrtc/system_wrappers/source/event_timer_posix.h

Index: webrtc/system_wrappers/source/event_timer_posix.h
diff --git a/webrtc/system_wrappers/source/event_timer_posix.h b/webrtc/system_wrappers/source/event_timer_posix.h
index af3715ee8b222186672f24eb031f2eb3827acd0b..599eb55ee16a1d4f783667e1bfaab717c2f15f93 100644
--- a/webrtc/system_wrappers/source/event_timer_posix.h
+++ b/webrtc/system_wrappers/source/event_timer_posix.h
@@ -13,6 +13,8 @@
 
 #include "webrtc/system_wrappers/include/event_wrapper.h"
 
+#include <memory>
+
 #include <pthread.h>
 #include <time.h>
 
@@ -49,9 +51,9 @@ class EventTimerPosix : public EventTimerWrapper {
   pthread_mutex_t mutex_;
   bool event_set_;
 
-  // TODO(pbos): Remove scoped_ptr and use PlatformThread directly.
-  rtc::scoped_ptr<rtc::PlatformThread> timer_thread_;
-  rtc::scoped_ptr<EventTimerPosix> timer_event_;
+  // TODO(pbos): Remove unique_ptr and use PlatformThread directly.
+  std::unique_ptr<rtc::PlatformThread> timer_thread_;
+  std::unique_ptr<EventTimerPosix> timer_event_;
   timespec       created_at_;
 
   bool          periodic_;