convert //gpu to std::unique_ptr

content/common/gpu/media/dxva_video_decode_accelerator_win.h

Index: content/common/gpu/media/dxva_video_decode_accelerator_win.h
diff --git a/content/common/gpu/media/dxva_video_decode_accelerator_win.h b/content/common/gpu/media/dxva_video_decode_accelerator_win.h
index 2d936ac99f928f8545ccca97c9974845688e1a37..10ad585bb746a28b4511cfd0e0f11639aa47ba22 100644
--- a/content/common/gpu/media/dxva_video_decode_accelerator_win.h
+++ b/content/common/gpu/media/dxva_video_decode_accelerator_win.h
@@ -9,6 +9,7 @@
 #include <d3d9.h>
 #include <initguid.h>
 #include <stdint.h>
+
 // Work around bug in this header by disabling the relevant warning for it.
 // https://connect.microsoft.com/VisualStudio/feedback/details/911260/dxva2api-h-in-win8-sdk-triggers-c4201-with-w4
 #pragma warning(push)
@@ -19,6 +20,7 @@
 
 #include <list>
 #include <map>
+#include <memory>
 #include <vector>
 
 #include "base/compiler_specific.h"