Revert of Adds a WebRTC browser_test with opus dtx enabled.

chrome/test/data/webrtc/munge_sdp.js

Index: chrome/test/data/webrtc/munge_sdp.js
diff --git a/chrome/test/data/webrtc/munge_sdp.js b/chrome/test/data/webrtc/munge_sdp.js
index c2c7d9b6e86af648cc7a8bb16b42a4db3016e87f..9a8a37e6d78a754b5c195dc119360c131b5711e1 100644
--- a/chrome/test/data/webrtc/munge_sdp.js
+++ b/chrome/test/data/webrtc/munge_sdp.js
@@ -16,40 +16,6 @@
  */
 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);
 }
 
 /**
@@ -184,16 +150,6 @@
 }
 
 /**
- * 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)