remove fConvolutionProcs from State, and just use it locally

src/core/SkBitmapScaler.h

Index: src/core/SkBitmapScaler.h
diff --git a/src/core/SkBitmapScaler.h b/src/core/SkBitmapScaler.h
index b88fb9e7757c2f83d25a421754b670f44d8ed8af..c8d8a84185e3601ef028ec56b44e3bcd5895d79a 100644
--- a/src/core/SkBitmapScaler.h
+++ b/src/core/SkBitmapScaler.h
@@ -92,7 +92,7 @@ public:
                        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
@@ -101,7 +101,7 @@ public:
                        const SkBitmap& source,
                        ResizeMethod method,
                        int dest_width, int dest_height,
-                       SkConvolutionProcs *convolveProcs = NULL,
+                       const SkConvolutionProcs&,
                        SkBitmap::Allocator* allocator = NULL);
 };