SkInstallDiscardablePixelRef is deprecated, enforce that

src/core/SkImageGeneratorPriv.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 SkImageGeneratorPriv_DEFINED
 #define SkImageGeneratorPriv_DEFINED
 
@@ skipping 15 matching lines @@
  *
  *  @param destination Upon success, this bitmap will be
  *  configured and have a pixelref installed.
  *
  *  @param factory If not nullptr, this object will be used as a
  *  source of discardable memory when decoding.  If nullptr, then
  *  SkDiscardableMemory::Create() will be called.
  *
  *  @return true iff successful.
  */
-bool SkInstallDiscardablePixelRef(SkImageGenerator*, const SkIRect* subset, SkBitmap* destination,
-                                  SkDiscardableMemory::Factory* factory);
+bool SkDEPRECATED_InstallDiscardablePixelRef(SkImageGenerator*, const SkIRect* subset,
+                                             SkBitmap* destination,
+                                             SkDiscardableMemory::Factory* factory);
 
 #endif