Fix a bug in the SDP parser in AppRTCMobile.

webrtc/examples/objc/AppRTCMobile/ARDSDPUtils.m

 /*
  *  Copyright 2015 The WebRTC 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.
  */
 
 #import "ARDSDPUtils.h"
 
 #import "WebRTC/RTCLogging.h"
 #import "WebRTC/RTCSessionDescription.h"
 
 @implementation ARDSDPUtils
 
 + (RTCSessionDescription *)
     descriptionForDescription:(RTCSessionDescription *)description
           preferredVideoCodec:(NSString *)codec {
   NSString *sdpString = description.sdp;
-  NSString *lineSeparator = @"\n";
+  NSString *lineSeparator = @"\r\n";
   NSString *mLineSeparator = @" ";
   // Copied from PeerConnectionClient.java.
   // TODO(tkchin): Move this to a shared C++ file.
   NSMutableArray *lines =
       [NSMutableArray arrayWithArray:
           [sdpString componentsSeparatedByString:lineSeparator]];
   // Find the line starting with "m=video".
   NSInteger mLineIndex = -1;
   for (NSInteger i = 0; i < lines.count; ++i) {
     if ([lines[i] hasPrefix:@"m=video"]) {
@@ skipping 56 matching lines @@
   NSString *newMLine = [newMLineParts componentsJoinedByString:mLineSeparator];
   [lines replaceObjectAtIndex:mLineIndex
                    withObject:newMLine];
 
   NSString *mangledSdpString = [lines componentsJoinedByString:lineSeparator];
   return [[RTCSessionDescription alloc] initWithType:description.type
                                                  sdp:mangledSdpString];
 }
 
 @end