Fix WinRT compilation issue in ShaderD3D.cpp
Fix WinRT compilation issue in ShaderD3D.cpp

Change-Id: If7bd4e9cdba3d893f2ee28a70b894af3fb37ae30
Reviewed-on: https://chromium-review.googlesource.com/304488
Tested-by: Austin Kinross <4e7ea65cff3a7294234757a0f33c94811ce2f382@microsoft.com>
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

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