Simplify flattening to just write enough to call the factory

include/effects/SkMatrixConvolutionImageFilter.h

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkMatrixConvolutionImageFilter_DEFINED
 #define SkMatrixConvolutionImageFilter_DEFINED
 
@@ skipping 59 matching lines @@
 protected:
     SkMatrixConvolutionImageFilter(const SkISize& kernelSize,
                                    const SkScalar* kernel,
                                    SkScalar gain,
                                    SkScalar bias,
                                    const SkIPoint& kernelOffset,
                                    TileMode tileMode,
                                    bool convolveAlpha,
                                    SkImageFilter* input,
                                    const CropRect* cropRect);
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
     explicit SkMatrixConvolutionImageFilter(SkReadBuffer& buffer);
+#endif
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
 
     virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
                                SkBitmap* result, SkIPoint* loc) const SK_OVERRIDE;
     virtual bool onFilterBounds(const SkIRect&, const SkMatrix&, SkIRect*) const SK_OVERRIDE;
 
 
 #if SK_SUPPORT_GPU
     virtual bool asNewEffect(GrEffect** effect,
                              GrTexture*,
@@ skipping 25 matching lines @@
                               SkBitmap* result,
                               const SkIRect& rect,
                               const SkIRect& bounds) const;
     void filterBorderPixels(const SkBitmap& src,
                             SkBitmap* result,
                             const SkIRect& rect,
                             const SkIRect& bounds) const;
 };
 
 #endif