Cleanup of code that converts from GPU-backed resources to SkImageInfo

src/gpu/GrSurfacePriv.h

Index: src/gpu/GrSurfacePriv.h
diff --git a/src/gpu/GrSurfacePriv.h b/src/gpu/GrSurfacePriv.h
index bff411edf3e0089d504daf9135a4b81592a0ef08..f2ba7baca4cf4d3abff33a6239a30843195f7916 100644
--- a/src/gpu/GrSurfacePriv.h
+++ b/src/gpu/GrSurfacePriv.h
@@ -32,11 +32,6 @@ public:
                                       int* left, int* top, int* width, int* height,
                                       const void** data,
                                       size_t* rowBytes);
-    /**
-     * Derive a SkImageInfo from the surface's descriptor. The caller must provide the alpha type as
-     * GrSurface has no equivalent.
-     */
-    SkImageInfo info(SkAlphaType alphaType) const { return fSurface->info(alphaType); }
 
     /**
      * Write the contents of the surface to a PNG. Returns true if successful.