Cleanup shared memory handling in DesktopCapturer interface.

webrtc/modules/desktop_capture/win/screen_capturer_win_gdi.h

Index: webrtc/modules/desktop_capture/win/screen_capturer_win_gdi.h
diff --git a/webrtc/modules/desktop_capture/win/screen_capturer_win_gdi.h b/webrtc/modules/desktop_capture/win/screen_capturer_win_gdi.h
index 202b9aaa87dd35c0611f337c16a6d0ef65654dd2..a91e7444808507d6891268b5f806d5c3d7e90a4e 100644
--- a/webrtc/modules/desktop_capture/win/screen_capturer_win_gdi.h
+++ b/webrtc/modules/desktop_capture/win/screen_capturer_win_gdi.h
@@ -34,6 +34,8 @@ class ScreenCapturerWinGdi : public ScreenCapturer {
 
   // Overridden from ScreenCapturer:
   void Start(Callback* callback) override;
+  void SetSharedMemoryFactory(
+      rtc::scoped_ptr<SharedMemoryFactory> shared_memory_factory) override;
   void Capture(const DesktopRegion& region) override;
   bool GetScreenList(ScreenList* screens) override;
   bool SelectScreen(ScreenId id) override;
@@ -52,6 +54,7 @@ class ScreenCapturerWinGdi : public ScreenCapturer {
   void CaptureCursor();
 
   Callback* callback_;
+  rtc::scoped_ptr<SharedMemoryFactory> shared_memory_factory_;
   ScreenId current_screen_id_;
   std::wstring current_device_key_;