delete include of private GrMtlTypes header (#38783)

Author: flar

shell/gpu/gpu_surface_metal_delegate.h

@@ -10,7 +10,6 @@
 #include "flutter/fml/macros.h"
 #include "third_party/skia/include/core/SkSize.h"
 #include "third_party/skia/include/core/SkSurface.h"
-#include "third_party/skia/include/gpu/mtl/GrMtlTypes.h"
 
 namespace flutter {
 

shell/gpu/gpu_surface_metal_skia.h

@@ -10,7 +10,6 @@
 #include "flutter/fml/macros.h"
 #include "flutter/shell/gpu/gpu_surface_metal_delegate.h"
 #include "third_party/skia/include/gpu/GrDirectContext.h"
-#include "third_party/skia/include/gpu/mtl/GrMtlTypes.h"
 
 namespace flutter {
 

shell/platform/darwin/graphics/FlutterDarwinExternalTextureMetal.mm

@@ -12,7 +12,6 @@
 #include "third_party/skia/include/gpu/GrBackendSurface.h"
 #include "third_party/skia/include/gpu/GrDirectContext.h"
 #include "third_party/skia/include/gpu/GrYUVABackendTextures.h"
-#include "third_party/skia/include/gpu/mtl/GrMtlTypes.h"
 
 FLUTTER_ASSERT_ARC
 

testing/test_metal_context.h

@@ -9,7 +9,6 @@
 #include <mutex>
 
 #include "third_party/skia/include/gpu/GrDirectContext.h"
-#include "third_party/skia/include/gpu/mtl/GrMtlTypes.h"
 
 namespace flutter {