Remove some dead code from VCMJitterBuffer.

webrtc/modules/video_coding/jitter_buffer.h

Index: webrtc/modules/video_coding/jitter_buffer.h
diff --git a/webrtc/modules/video_coding/jitter_buffer.h b/webrtc/modules/video_coding/jitter_buffer.h
index a3e9ace91ecc8ef34269753e550dee3abb3e8681..66f0ffe4c1af0adc1348df6b23c342d6e8dbc68e 100644
--- a/webrtc/modules/video_coding/jitter_buffer.h
+++ b/webrtc/modules/video_coding/jitter_buffer.h
@@ -129,10 +129,6 @@ class VCMJitterBuffer {
   // was started.
   FrameCounts FrameStatistics() const;
 
-  // The number of packets discarded by the jitter buffer because the decoder
-  // won't be able to decode them.
-  int num_not_decodable_packets() const;
-
   // Gets number of packets received.
   int num_packets() const;
 
@@ -145,12 +141,6 @@ class VCMJitterBuffer {
   // Statistics, Calculate frame and bit rates.
   void IncomingRateStatistics(unsigned int* framerate, unsigned int* bitrate);
 
-  // Checks if the packet sequence will be complete if the next frame would be
-  // grabbed for decoding. That is, if a frame has been lost between the
-  // last decoded frame and the next, or if the next frame is missing one
-  // or more packets.
-  bool CompleteSequenceWithNextFrame();
-
   // Wait |max_wait_time_ms| for a complete frame to arrive.
   // If found, a pointer to the frame is returned. Returns nullptr otherwise.
   VCMEncodedFrame* NextCompleteFrame(uint32_t max_wait_time_ms);
@@ -208,7 +198,6 @@ class VCMJitterBuffer {
   // Set decode error mode - Should not be changed in the middle of the
   // session. Changes will not influence frames already in the buffer.
   void SetDecodeErrorMode(VCMDecodeErrorMode error_mode);
-  int64_t LastDecodedTimestamp() const;
   VCMDecodeErrorMode decode_error_mode() const { return decode_error_mode_; }
 
   void RegisterStatsCallback(VCMReceiveStatisticsCallback* callback);