Track pending ICE restarts independently for different media sections.

talk/session/media/mediasession.h

Index: talk/session/media/mediasession.h
diff --git a/talk/session/media/mediasession.h b/talk/session/media/mediasession.h
index 17a2c1be6f4d6b8ac3c413891f35d9b46984e803..cd11a290685bdff46e8a5179aafed56dbe3f0d00 100644
--- a/talk/session/media/mediasession.h
+++ b/talk/session/media/mediasession.h
@@ -536,6 +536,8 @@ bool IsMediaContent(const ContentInfo* content);
 bool IsAudioContent(const ContentInfo* content);
 bool IsVideoContent(const ContentInfo* content);
 bool IsDataContent(const ContentInfo* content);
+const ContentInfo* GetFirstMediaContent(const ContentInfos& contents,
+                                        MediaType media_type);
 const ContentInfo* GetFirstAudioContent(const ContentInfos& contents);
 const ContentInfo* GetFirstVideoContent(const ContentInfos& contents);
 const ContentInfo* GetFirstDataContent(const ContentInfos& contents);