remove fConvolutionProcs from State, and just use it locally

src/core/SkBitmapScaler.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBitmapScaler_DEFINED
 #define SkBitmapScaler_DEFINED
 
@@ skipping 74 matching lines @@
     //
     // The output image will be (dest_subset.width(), dest_subset.height()). This
     // will save work if you do not need the entire bitmap.
     //
     // The destination subset must be smaller than the destination image.
     static bool Resize(SkBitmap* result,
                        const SkBitmap& source,
                        ResizeMethod method,
                        int dest_width, int dest_height,
                        const SkIRect& dest_subset,
-                       SkConvolutionProcs *convolveProcs = NULL,
+                       const SkConvolutionProcs&,
                        SkBitmap::Allocator* allocator = NULL);
 
     // Alternate version for resizing and returning the entire bitmap rather than
     // a subset.
     static bool Resize(SkBitmap* result,
                        const SkBitmap& source,
                        ResizeMethod method,
                        int dest_width, int dest_height,
-                       SkConvolutionProcs *convolveProcs = NULL,
+                       const SkConvolutionProcs&,
                        SkBitmap::Allocator* allocator = NULL);
 };
 
 #endif