Fix http://crbug.com/741252

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..18ca99097074eade1f065105950fd6db2bc1ad8f 100644
--- a/webrtc/modules/desktop_capture/win/dxgi_context.cc
+++ b/webrtc/modules/desktop_capture/win/dxgi_context.cc
@@ -21,10 +21,11 @@ DxgiAdapterContext::~DxgiAdapterContext() = default;
 DxgiFrameContext::DxgiFrameContext() = default;
 
 DxgiFrameContext::~DxgiFrameContext() {
-  DxgiDuplicatorController::Instance()->Unregister(this);
+  Reset();
 }
 
 void DxgiFrameContext::Reset() {
+  DxgiDuplicatorController::Instance()->Unregister(this);
   controller_id = 0;
 }