Revert of Adds a WebRTC browser_test with opus dtx enabled.

chrome/test/data/webrtc/munge_sdp.js

 /**
  * Copyright 2016 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.
  */
 
 /**
  * See |setSdpDefaultCodec|.
  */
 function setSdpDefaultAudioCodec(sdp, codec) {
   return setSdpDefaultCodec(sdp, 'audio', codec);
 }
 
 /**
  * See |setSdpDefaultCodec|.
  */
 function setSdpDefaultVideoCodec(sdp, codec) {
   return setSdpDefaultCodec(sdp, 'video', codec);
 }
 
 /**
- * Returns a modified version of |sdp| where the opus DTX flag has been
- * enabled.
- */
-function setOpusDtxEnabled(sdp) {
-  var sdpLines = splitSdpLines(sdp);
-
-  // Get default audio codec
-  var defaultCodec = getSdpDefaultAudioCodec(sdp);
-  if (defaultCodec !== 'opus') {
-    failure('setOpusDtxEnabled',
-             'Default audio codec is not set to \'opus\'.');
-  }
-
-  // Find codec ID for Opus, e.g. 111 if 'a=rtpmap:111 opus/48000/2'.
-  var codecId = findRtpmapId(sdpLines, 'opus');
-  if (codecId === null) {
-    failure('setOpusDtxEnabled', 'Unknown ID for |codec| = \'opus\'.');
-  }
-
-  // Find 'a=fmtp:111' line, where 111 is the codecId
-  var fmtLineNo = findFmtpLine(sdpLines, codecId);
-  if (fmtLineNo === null) {
-    // Add the line to the SDP.
-    newLine = 'a=fmtp:' + codecId + ' usedtx=1'
-    rtpMapLine = findRtpmapLine(sdpLines, codecId);
-    sdpLines.splice(rtpMapLine + 1, 0, newLine);
-  } else {
-    // Modify the line to enable Opus Dtx.
-    sdpLines[fmtLineNo] += ';usedtx=1'
-  }
-  return mergeSdpLines(sdpLines);
-}
-
-/**
  * Returns a modified version of |sdp| where the |codec| has been promoted to be
  * the default codec, i.e. the codec whose ID is first in the list of codecs on
  * the 'm=|type|' line, where |type| is 'audio' or 'video'.
  * @private
  */
 function setSdpDefaultCodec(sdp, type, codec) {
   var sdpLines = splitSdpLines(sdp);
 
   // Find codec ID, e.g. 100 for 'VP8' if 'a=rtpmap:100 VP8/9000'.
   var codecId = findRtpmapId(sdpLines, codec);
@@ skipping 111 matching lines @@
       if (!sdpLines[i].match(pattern))
         failure('findRtpmapLine', 'Unexpected "a=rtpmap:" pattern.');
       // Return line index.
       return i;
     }
   }
   return null;
 }
 
 /**
- * Finds the fmtp line in |sdpLines| for the given |codecId|, and returns its
- * line number. The line starts with 'a=fmtp:<codecId>'.
- * @private
- */
-function findFmtpLine(sdpLines, codecId) {
-  return findLine(sdpLines, 'a=fmtp:' + codecId);
-
-}
-
-/**
  * Returns a modified version of |mLine| that has |codecId| first in the list of
  * codec IDs. For example, setMLineDefaultCodec(
  *     'm=video 9 UDP/TLS/RTP/SAVPF 100 101 107 116 117 96', 107)
  * Returns:
  *     'm=video 9 UDP/TLS/RTP/SAVPF 107 100 101 116 117 96'
  * @private
  */
 function setMLineDefaultCodec(mLine, codecId) {
   var elements = mLine.split(' ');
 
@@ skipping 37 matching lines @@
 }
 
 /** @private */
 function findLine(lines, startsWith) {
   for (var i = 0; i < lines.length; i++) {
     if (lines[i].startsWith(startsWith))
       return i;
   }
   return null;
 }