Simplify flattening to just write enough to call the factory

src/core/SkLocalMatrixShader.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkLocalMatrixShader_DEFINED
 #define SkLocalMatrixShader_DEFINED
 
@@ skipping 46 matching lines @@
         if (localMatrix) {
             *localMatrix = this->getLocalMatrix();
         }
         return SkRef(fProxyShader.get());
     }
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLocalMatrixShader)
 
 protected:
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
     SkLocalMatrixShader(SkReadBuffer&);
+#endif
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
     virtual Context* onCreateContext(const ContextRec&, void*) const SK_OVERRIDE;
 
 private:
     SkAutoTUnref<SkShader> fProxyShader;
 
     typedef SkShader INHERITED;
 };
 
 #endif