Replace scoped_ptr with unique_ptr everywhere

webrtc/system_wrappers/source/file_impl.h

Index: webrtc/system_wrappers/source/file_impl.h
diff --git a/webrtc/system_wrappers/source/file_impl.h b/webrtc/system_wrappers/source/file_impl.h
index 06ba58200bb909e91bfb5797fe347bd00da00f63..8764f720f306c3c9155ec4da2e5f06c2c74280d1 100644
--- a/webrtc/system_wrappers/source/file_impl.h
+++ b/webrtc/system_wrappers/source/file_impl.h
@@ -13,6 +13,8 @@
 
 #include <stdio.h>
 
+#include <memory>
+
 #include "webrtc/base/scoped_ptr.h"
 #include "webrtc/system_wrappers/include/file_wrapper.h"
 
@@ -52,7 +54,7 @@ class FileWrapperImpl : public FileWrapper {
   int CloseFileImpl();
   int FlushImpl();
 
-  rtc::scoped_ptr<RWLockWrapper> rw_lock_;
+  std::unique_ptr<RWLockWrapper> rw_lock_;
 
   FILE* id_;
   bool managed_file_handle_;