Replace scoped_ptr with unique_ptr everywhere

webrtc/system_wrappers/include/clock.h

Index: webrtc/system_wrappers/include/clock.h
diff --git a/webrtc/system_wrappers/include/clock.h b/webrtc/system_wrappers/include/clock.h
index f443057bea364a3aa8f3f42e5c24cf2a41bbe6f6..8245ecd9f45a1be1013e658809eb53a2399fc3a9 100644
--- a/webrtc/system_wrappers/include/clock.h
+++ b/webrtc/system_wrappers/include/clock.h
@@ -11,6 +11,8 @@
 #ifndef WEBRTC_SYSTEM_WRAPPERS_INCLUDE_CLOCK_H_
 #define WEBRTC_SYSTEM_WRAPPERS_INCLUDE_CLOCK_H_
 
+#include <memory>
+
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/system_wrappers/include/rw_lock_wrapper.h"
 #include "webrtc/typedefs.h"
@@ -76,7 +78,7 @@ class SimulatedClock : public Clock {
 
  private:
   int64_t time_us_;
-  rtc::scoped_ptr<RWLockWrapper> lock_;
+  std::unique_ptr<RWLockWrapper> lock_;
 };
 
 };  // namespace webrtc