Revert of Delete all use of cricket::VideoFrame and cricket::WebRtcVideoFrame.

webrtc/examples/peerconnection/client/linux/main_wnd.h

Index: webrtc/examples/peerconnection/client/linux/main_wnd.h
diff --git a/webrtc/examples/peerconnection/client/linux/main_wnd.h b/webrtc/examples/peerconnection/client/linux/main_wnd.h
index 33b0725c08898bb3cfa98a8680466b6472c63d2c..3c718577d1024bcd039eddeb97e2736041e1c313 100644
--- a/webrtc/examples/peerconnection/client/linux/main_wnd.h
+++ b/webrtc/examples/peerconnection/client/linux/main_wnd.h
@@ -72,14 +72,14 @@
   void OnRedraw();
 
  protected:
-  class VideoRenderer : public rtc::VideoSinkInterface<webrtc::VideoFrame> {
+  class VideoRenderer : public rtc::VideoSinkInterface<cricket::VideoFrame> {
    public:
     VideoRenderer(GtkMainWnd* main_wnd,
                   webrtc::VideoTrackInterface* track_to_render);
     virtual ~VideoRenderer();
 
     // VideoSinkInterface implementation
-    void OnFrame(const webrtc::VideoFrame& frame) override;
+    void OnFrame(const cricket::VideoFrame& frame) override;
 
     const uint8_t* image() const { return image_.get(); }