Revert of Remove remains of webrtc/base (patchset #7 id:120001 of https://codereview.webrtc.org/297…

webrtc/base/md5.h

+/*
+ * This is the header file for the MD5 message-digest algorithm.
+ * The algorithm is due to Ron Rivest.  This code was
+ * written by Colin Plumb in 1993, no copyright is claimed.
+ * This code is in the public domain; do with it what you wish.
+ *
+ * Equivalent code is available from RSA Data Security, Inc.
+ * This code has been tested against that, and is equivalent,
+ * except that you don't need to include two pages of legalese
+ * with every copy.
+ * To compute the message digest of a chunk of bytes, declare an
+ * MD5Context structure, pass it to MD5Init, call MD5Update as
+ * needed on buffers full of bytes, and then call MD5Final, which
+ * will fill a supplied 16-byte array with the digest.
+ *
+ */
+
+// Changes(fbarchard): Ported to C++ and Google style guide.
+// Made context first parameter in MD5Final for consistency with Sha1.
+// Changes(hellner): added rtc namespace
+// Changes(pbos): Reverted types back to uint32(8)_t with _t suffix.
+
+#ifndef WEBRTC_BASE_MD5_H_
+#define WEBRTC_BASE_MD5_H_
+
+
+// This header is deprecated and is just left here temporarily during
+// refactoring. See https://bugs.webrtc.org/7634 for more details.
+#include "webrtc/rtc_base/md5.h"
+
+#endif  // WEBRTC_BASE_MD5_H_