Removed #ifdef for C++ dependent code in TextureCache.

ScriptableRenderPipeline/Core/TextureCache.cs

-#define NATIVE_CODE_FOR_CMD_CONVERT_TEXTURE
-
 using UnityEngine;
 using System.Collections.Generic;
 using UnityEngine.Rendering;
 
             if (mismatch)
             {
-#if NATIVE_CODE_FOR_CMD_CONVERT_TEXTURE
-#else
-                UnityEngine.Graphics.ConvertTexture(texture, 0, m_Cache, sliceIndex);
-#endif
             }
             else
             {
                 {
                     for (int f = 0; f < 6; f++)
                     {
-#if NATIVE_CODE_FOR_CMD_CONVERT_TEXTURE
-#else
-                        UnityEngine.Graphics.ConvertTexture(texture, f, m_Cache, 6 * sliceIndex + f);
-#endif
                     }
                 }
                 else