Remove image decoder and encoder autoregistration

src/images/SkImageDecoder_libgif.h

Index: src/images/SkImageDecoder_libgif.h
diff --git a/src/images/SkImageDecoder_libgif.h b/src/images/SkImageDecoder_libgif.h
new file mode 100644
index 0000000000000000000000000000000000000000..bbdb7091f78ac46220767cdee0876ef20c2d224e
--- /dev/null
+++ b/src/images/SkImageDecoder_libgif.h
@@ -0,0 +1,16 @@
+/*
+ * 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 SkImageDecoder_libgif_DEFINED
+#define SkImageDecoder_libgif_DEFINED
+
+#include "SkImageDecoder.h"
+
+SkImageDecoder* SkCreateGIFImageDecoder(SkImageDecoder::Format format);
+SkImageDecoder::Format SkDetectFormatGIFImageDecoder(SkStreamRewindable* stream);
+
+#endif