Revert "Add missing Gr headers to GN file."
Revert "Add missing Gr headers to GN file."

This reverts commit 3b8204039bdb797aa09e2a249c936964eb455311.

Reason for revert: GrVkTypesPriv and GrD3DTypesPriv are now listed twice and break VS.

Original change's description:
> Add missing Gr headers to GN file.
>
> Change-Id: Id01cc2c3bf54bad21cba105b8302d57f424e1ba2
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/363938
> Commit-Queue: John Stiles <johnstiles@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>
> Auto-Submit: John Stiles <johnstiles@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>

TBR=brianosman@google.com,johnstiles@google.com

Change-Id: I3e6e18aacc8880d60dfa6c60b97c4b5c8f5018a8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/363786
Reviewed-by: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>
Commit-Queue: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>

google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia