Remove image decoder and encoder autoregistration

src/images/SkImageDecoder_libwebp.h

Index: src/images/SkImageDecoder_libwebp.h
diff --git a/src/images/SkImageDecoder_libwebp.h b/src/images/SkImageDecoder_libwebp.h
new file mode 100644
index 0000000000000000000000000000000000000000..817359822e096537a8199c9bc22b931183829cac
--- /dev/null
+++ b/src/images/SkImageDecoder_libwebp.h
@@ -0,0 +1,19 @@
+/*
+ * 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_libwebp_DEFINED
+#define SkImageDecoder_libwebp_DEFINED
+
+#include "SkImageDecoder.h"
+#include "SkImageEncoder.h"
+
+SkImageDecoder* SkCreateWEBPImageDecoder(SkImageDecoder::Format format);
+SkImageDecoder::Format SkDetectFormatWEBPImageDecoder(SkStreamRewindable* stream);
+
+SkImageEncoder* SkCreateWEBPImageEncoder(SkImageEncoder::Type t);
+
+#endif