[Ozone-DRI] Removing MockDriSurface implementation

ui/ozone/platform/dri/dri_buffer.h

Index: ui/ozone/platform/dri/dri_buffer.h
diff --git a/ui/ozone/platform/dri/dri_buffer.h b/ui/ozone/platform/dri/dri_buffer.h
index 072e007fcf8db53682e8f3f6c47aaeb1edc93c71..342f6a6085d42310252e0f4766bb92602c291f11 100644
--- a/ui/ozone/platform/dri/dri_buffer.h
+++ b/ui/ozone/platform/dri/dri_buffer.h
@@ -21,7 +21,7 @@ class DriWrapper;
 class DriBuffer {
  public:
   DriBuffer(DriWrapper* dri);
-  virtual ~DriBuffer();
+  ~DriBuffer();
 
   uint32_t stride() const { return stride_; }
   uint32_t handle() const { return handle_; }
@@ -30,9 +30,9 @@ class DriBuffer {
 
   // Allocates the backing pixels and wraps them in |surface_|. |info| is used
   // to describe the buffer characteristics (size, color format).
-  virtual bool Initialize(const SkImageInfo& info);
+  bool Initialize(const SkImageInfo& info);
 
- protected:
+ private:
   DriWrapper* dri_;  // Not owned.
 
   // Wrapper around the native pixel memory.