Fix include case for dxgi1_4.h

This include is technically all lower case. This fixes building in
environments that are case sensitive.

Change-Id: I88cea4facf7c47b5c1c1cdb5cf08a29ede1e6689
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/171340
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
Kokoro: Austin Eng <enga@chromium.org>
Auto-Submit: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
diff --git a/include/dawn/native/D3D12Backend.h b/include/dawn/native/D3D12Backend.h
index 935adc9..42e0947 100644
--- a/include/dawn/native/D3D12Backend.h
+++ b/include/dawn/native/D3D12Backend.h
@@ -28,8 +28,8 @@
 #ifndef INCLUDE_DAWN_NATIVE_D3D12BACKEND_H_
 #define INCLUDE_DAWN_NATIVE_D3D12BACKEND_H_
 
-#include <DXGI1_4.h>
 #include <d3d12.h>
+#include <dxgi1_4.h>
 #include <windows.h>
 #include <wrl/client.h>