Update talk to 55821645.

TEST=try bots
R=mallinath@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/3139004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5053 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/talk/app/webrtc/webrtcsdp.cc b/talk/app/webrtc/webrtcsdp.cc
index 610250e..ce23459 100644
--- a/talk/app/webrtc/webrtcsdp.cc
+++ b/talk/app/webrtc/webrtcsdp.cc
@@ -2188,6 +2188,12 @@
       return ParseFailed("", description.str(), error);
     }
   }
+
+  size_t end_of_message = message.size();
+  if (mline_index == -1 && *pos != end_of_message) {
+    ParseFailed(message, *pos, "Expects m line.", error);
+    return false;
+  }
   return true;
 }