Simplify flattening to just write enough to call the factory

include/effects/SkColorMatrixFilter.h

 /*
  * Copyright 2007 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 SkColorMatrixFilter_DEFINED
 #define SkColorMatrixFilter_DEFINED
 
@@ skipping 23 matching lines @@
         int     fShift;
     };
 
     SK_TO_STRING_OVERRIDE()
 
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkColorMatrixFilter)
 
 protected:
     explicit SkColorMatrixFilter(const SkColorMatrix&);
     explicit SkColorMatrixFilter(const SkScalar array[20]);
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
     explicit SkColorMatrixFilter(SkReadBuffer& buffer);
+#endif
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
 
 private:
     SkColorMatrix fMatrix;
 
     typedef void (*Proc)(const State&, unsigned r, unsigned g, unsigned b,
                          unsigned a, int32_t result[4]);
 
     Proc        fProc;
     State       fState;
     uint32_t    fFlags;
 
     void initState(const SkScalar array[20]);
 
     typedef SkColorFilter INHERITED;
 };
 
 #endif