Add support for avc3 codec string.

net/base/mime_util.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 #include <iterator>
 #include <map>
 #include <string>
 
 #include "base/containers/hash_tables.h"
@@ skipping 297 matching lines @@
           // on Android. https://crbug.com/285016
 #endif
   "vorbis",
   "vp8",
   "1"  // WAVE_FORMAT_PCM.
 };
 
 // List of proprietary codecs only supported by Google Chrome.
 static const char* const proprietary_media_codecs[] = {
   "avc1",
+  "avc3",
   "mp4a"
 };
 
 // Note: does not include javascript types list (see supported_javascript_types)
 static const char* const supported_non_image_types[] = {
   "text/cache-manifest",
   "text/html",
   "text/xml",
   "text/xsl",
   "text/plain",
@@ skipping 671 matching lines @@
   post_data->append("\r\n" + value + "\r\n");
 }
 
 void AddMultipartFinalDelimiterForUpload(const std::string& mime_boundary,
                                          std::string* post_data) {
   DCHECK(post_data);
   post_data->append("--" + mime_boundary + "--\r\n");
 }
 
 }  // namespace net