Add reference counter of DxgiDuplicatorController to unload DXGI components

webrtc/modules/desktop_capture/win/dxgi_context.cc

Index: webrtc/modules/desktop_capture/win/dxgi_context.cc
diff --git a/webrtc/modules/desktop_capture/win/dxgi_context.cc b/webrtc/modules/desktop_capture/win/dxgi_context.cc
index dffefc404f67da729b73a8b56553869d015d153d..9a078193b493f8c4eb413fc4e19efc8ba4ae8bbe 100644
--- a/webrtc/modules/desktop_capture/win/dxgi_context.cc
+++ b/webrtc/modules/desktop_capture/win/dxgi_context.cc
@@ -9,6 +9,7 @@
  */
 
 #include "webrtc/modules/desktop_capture/win/dxgi_context.h"
+
 #include "webrtc/modules/desktop_capture/win/dxgi_duplicator_controller.h"
 
 namespace webrtc {
@@ -21,7 +22,7 @@ DxgiAdapterContext::~DxgiAdapterContext() = default;
 DxgiFrameContext::DxgiFrameContext() = default;
 
 DxgiFrameContext::~DxgiFrameContext() {
-  DxgiDuplicatorController::Instance()->Unregister(this);
+  DxgiDuplicatorController::GetReference()->Unregister(this);
 }
 
 void DxgiFrameContext::Reset() {