Replace scoped_ptr with unique_ptr in webrtc/modules/desktop_capture/

webrtc/modules/desktop_capture/cropped_desktop_frame.cc

Index: webrtc/modules/desktop_capture/cropped_desktop_frame.cc
diff --git a/webrtc/modules/desktop_capture/cropped_desktop_frame.cc b/webrtc/modules/desktop_capture/cropped_desktop_frame.cc
index 2c709733e158e479b0e634bd9127f96ff9c15dab..f57fc572b6581a24123d82866eacda631de04239 100644
--- a/webrtc/modules/desktop_capture/cropped_desktop_frame.cc
+++ b/webrtc/modules/desktop_capture/cropped_desktop_frame.cc
@@ -8,6 +8,8 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include <memory>
+
 #include "webrtc/modules/desktop_capture/cropped_desktop_frame.h"
 
 namespace webrtc {
@@ -18,7 +20,7 @@ class CroppedDesktopFrame : public DesktopFrame {
   CroppedDesktopFrame(DesktopFrame* frame, const DesktopRect& rect);
 
  private:
-  rtc::scoped_ptr<DesktopFrame> frame_;
+  std::unique_ptr<DesktopFrame> frame_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(CroppedDesktopFrame);
 };