Various QUIC cleanups to sync with internal code.

net/quic/congestion_control/cubic.h

Index: net/quic/congestion_control/cubic.h
diff --git a/net/quic/congestion_control/cubic.h b/net/quic/congestion_control/cubic.h
index e365bbe0ed79c03c9042ce57e68d76d91df456ed..a7015964e2bfb03d01cbd57a50f66f855333d719 100644
--- a/net/quic/congestion_control/cubic.h
+++ b/net/quic/congestion_control/cubic.h
@@ -39,11 +39,6 @@ class NET_EXPORT_PRIVATE Cubic {
       QuicTcpCongestionWindow current,
       QuicTime::Delta delay_min);
 
- protected:
-  // Calculates the cubic root using a table lookup followed by one Newton-
-  // Raphson iteration.
-  uint32 CubeRoot(uint64 a);
-
  private:
   static const QuicTime::Delta MaxCubicTimeInterval() {
     return QuicTime::Delta::FromMilliseconds(30);
@@ -84,4 +79,5 @@ class NET_EXPORT_PRIVATE Cubic {
 };
 
 }  // namespace net
+
 #endif  // NET_QUIC_CONGESTION_CONTROL_CUBIC_H_