Move libvpx from DEPS to src

third_party/libvpx/source/libvpx/vp9/decoder/vp9_dsubexp.h

Index: third_party/libvpx/source/libvpx/vp9/decoder/vp9_dsubexp.h
diff --git a/third_party/libvpx/source/libvpx/vp9/decoder/vp9_dsubexp.h b/third_party/libvpx/source/libvpx/vp9/decoder/vp9_dsubexp.h
new file mode 100644
index 0000000000000000000000000000000000000000..436f434fb18b3e4372ec89df82772899b17271c8
--- /dev/null
+++ b/third_party/libvpx/source/libvpx/vp9/decoder/vp9_dsubexp.h
@@ -0,0 +1,27 @@
+/*
+ *  Copyright (c) 2013 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+#ifndef VP9_DECODER_VP9_DSUBEXP_H_
+#define VP9_DECODER_VP9_DSUBEXP_H_
+
+#include "vp9/decoder/vp9_reader.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void vp9_diff_update_prob(vp9_reader *r, vp9_prob* p);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // VP9_DECODER_VP9_DSUBEXP_H_