Move shared_desktop_frame.cc to webrtc/modules/desktop_capture:primitives

webrtc/modules/desktop_capture/shared_desktop_frame.h

Index: webrtc/modules/desktop_capture/shared_desktop_frame.h
diff --git a/webrtc/modules/desktop_capture/shared_desktop_frame.h b/webrtc/modules/desktop_capture/shared_desktop_frame.h
index d9a521b0642d8a6c47d936acbfe97d8762a5f64d..f4c3b673425904440c1728d84fa580f98053f29a 100644
--- a/webrtc/modules/desktop_capture/shared_desktop_frame.h
+++ b/webrtc/modules/desktop_capture/shared_desktop_frame.h
@@ -22,7 +22,7 @@ namespace webrtc {
 // sharing the same buffer.
 class SharedDesktopFrame : public DesktopFrame {
  public:
-  virtual ~SharedDesktopFrame();
+  ~SharedDesktopFrame() override;
 
   static std::unique_ptr<SharedDesktopFrame> Wrap(
       std::unique_ptr<DesktopFrame> desktop_frame);