Enable dng testing on windows

IIRC, we had problems with OOM testing dng on windows.  Since then,
I think we have replaced our dng test images with smaller versions.
I think we can gives this another shot.

CQ_INCLUDE_TRYBOTS=skia.primary:Test-Win2k8-MSVC-GCE-CPU-AVX2-x86_64-Debug

BUG=skia:

Change-Id: I05a20c2c0bcfdc2f5eb0bde20e3f4fc92f614d9d
Reviewed-on: https://skia-review.googlesource.com/9913
Reviewed-by: Leon Scroggins <scroggo@google.com>
Commit-Queue: Matt Sarett <msarett@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 5df2b4a..f8e6548 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -39,8 +39,7 @@
   skia_vulkan_sdk = getenv("VULKAN_SDK")
 }
 declare_args() {
-  skia_use_dng_sdk =
-      !is_fuchsia && !is_win && skia_use_libjpeg_turbo && skia_use_zlib
+  skia_use_dng_sdk = !is_fuchsia && skia_use_libjpeg_turbo && skia_use_zlib
   skia_use_sfntly = skia_use_icu
 
   if (is_android) {