Remove all uses of skia::RefPtr and stale includes

ui/ozone/platform/drm/gpu/drm_buffer.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_OZONE_PLATFORM_DRM_GPU_DRM_BUFFER_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_DRM_BUFFER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/macros.h"
-#include "skia/ext/refptr.h"
-#include "third_party/skia/include/core/SkSurface.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
 #include "ui/ozone/platform/drm/gpu/scanout_buffer.h"
 
+class SkCanvas;
+struct SkImageInfo;
+class SkSurface;
+
 namespace ui {
 
 class DrmDevice;
 
 // Wrapper for a DRM allocated buffer. Keeps track of the native properties of
 // the buffer and wraps the pixel memory into a SkSurface which can be used to
 // draw into using Skia.
 class DrmBuffer : public ScanoutBuffer {
  public:
   DrmBuffer(const scoped_refptr<DrmDevice>& drm);
@@ skipping 39 matching lines @@
 
   // Wrapper around the native pixel memory.
   sk_sp<SkSurface> surface_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmBuffer);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_GPU_DRM_BUFFER_H_