Remove SkAutoTUnref and SkAutoTDelete from public includes.

include/gpu/vk/GrVkBackendContext.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrVkBackendContext_DEFINED
 #define GrVkBackendContext_DEFINED
 
@@ skipping 19 matching lines @@
     kSampleRateShading_GrVkFeatureFlag = 0x0004,
 };
 
 // The BackendContext contains all of the base Vulkan objects needed by the GrVkGpu. The assumption
 // is that the client will set these up and pass them to the GrVkGpu constructor. The VkDevice
 // created must support at least one graphics queue, which is passed in as well. 
 // The QueueFamilyIndex must match the family of the given queue. It is needed for CommandPool 
 // creation, and any GrBackendObjects handed to us (e.g., for wrapped textures) need to be created
 // in or transitioned to that family.
 struct GrVkBackendContext : public SkRefCnt {
-    VkInstance                        fInstance;
-    VkPhysicalDevice                  fPhysicalDevice;
-    VkDevice                          fDevice;
-    VkQueue                           fQueue;
-    uint32_t                          fGraphicsQueueIndex;
-    uint32_t                          fMinAPIVersion;
-    uint32_t                          fExtensions;
-    uint32_t                          fFeatures;
-    SkAutoTUnref<const GrVkInterface> fInterface;
+    VkInstance                 fInstance;
+    VkPhysicalDevice           fPhysicalDevice;
+    VkDevice                   fDevice;
+    VkQueue                    fQueue;
+    uint32_t                   fGraphicsQueueIndex;
+    uint32_t                   fMinAPIVersion;
+    uint32_t                   fExtensions;
+    uint32_t                   fFeatures;
+    sk_sp<const GrVkInterface> fInterface;
 
     using CanPresentFn = std::function<bool(VkInstance, VkPhysicalDevice,
                                             uint32_t queueFamilyIndex)>;
 
     // Helper function to create the default Vulkan objects needed by the GrVkGpu object
     // If presentQueueIndex is non-NULL, will try to set up presentQueue as part of device
     // creation using the platform-specific canPresent() function.
     static const GrVkBackendContext* Create(uint32_t* presentQueueIndex = nullptr,
                                             CanPresentFn = CanPresentFn());
 
     ~GrVkBackendContext() override;
 };
 
 #endif