Remove image decoder and encoder autoregistration

include/images/SkForceLinking.h

Index: include/images/SkForceLinking.h
diff --git a/include/images/SkForceLinking.h b/include/images/SkForceLinking.h
deleted file mode 100644
index 39901f612ed2db90dc0c684a28c9b440662d2022..0000000000000000000000000000000000000000
--- a/include/images/SkForceLinking.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/*
- * Copyright 2013 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-/**
- *  This function's sole purpose is to trick the linker into not discarding
- *  SkImageDecoder subclasses just because we do not directly call them.
- *  This is necessary in applications that will create image decoders from
- *  a stream.
- *  Call this function with an expression that evaluates to false to ensure
- *  that the linker includes the subclasses.
- *  Passing true will result in leaked objects.
- */
-int SkForceLinking(bool doNotPassTrue);
-
-#define __SK_FORCE_IMAGE_DECODER_LINKING       \
-static int linking_forced = SkForceLinking(false)