Renamed WebRTCStats.h to WebRTCLegacyStats.h and cleaned it up

content/renderer/media/rtc_peer_connection_handler.h

Index: content/renderer/media/rtc_peer_connection_handler.h
diff --git a/content/renderer/media/rtc_peer_connection_handler.h b/content/renderer/media/rtc_peer_connection_handler.h
index da54ce44a8f05f5816ea05a7776f1906ef5f5d80..00e3067d81f978672e05146de94429c7f92aae17 100644
--- a/content/renderer/media/rtc_peer_connection_handler.h
+++ b/content/renderer/media/rtc_peer_connection_handler.h
@@ -30,9 +30,9 @@ namespace blink {
 class WebFrame;
 class WebRTCAnswerOptions;
 class WebRTCDataChannelHandler;
+class WebRTCLegacyStats;
 class WebRTCOfferOptions;
 class WebRTCPeerConnectionHandlerClient;
-class WebRTCStats;
 }
 
 namespace content {
@@ -52,7 +52,7 @@ class CONTENT_EXPORT LocalRTCStatsResponse
   }
 
   virtual blink::WebRTCStatsResponse webKitStatsResponse() const;
-  virtual void addStats(const blink::WebRTCStats& stats);
+  virtual void addStats(const blink::WebRTCLegacyStats& stats);
 
  protected:
   ~LocalRTCStatsResponse() override {}