Simplify flattening to just write enough to call the factory

include/effects/SkTableMaskFilter.h

 /*
  * Copyright 2006 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 SkTableMaskFilter_DEFINED
 #define SkTableMaskFilter_DEFINED
 
@@ skipping 37 matching lines @@
     virtual SkMask::Format getFormat() const SK_OVERRIDE;
     virtual bool filterMask(SkMask*, const SkMask&, const SkMatrix&,
                             SkIPoint*) const SK_OVERRIDE;
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTableMaskFilter)
 
 protected:
     SkTableMaskFilter();
     explicit SkTableMaskFilter(const uint8_t table[256]);
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
     explicit SkTableMaskFilter(SkReadBuffer& rb);
+#endif
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
 
 private:
     uint8_t fTable[256];
 
     typedef SkMaskFilter INHERITED;
 };
 
 #endif