FilePlayer: Remove unused default values for arguments

webrtc/modules/utility/source/file_player.cc

Index: webrtc/modules/utility/source/file_player.cc
diff --git a/webrtc/modules/utility/source/file_player.cc b/webrtc/modules/utility/source/file_player.cc
index c6429b8b0d65216e90731ee57c0129277704271f..4b33929ef00696f11111c8d04945bcd2da424596 100644
--- a/webrtc/modules/utility/source/file_player.cc
+++ b/webrtc/modules/utility/source/file_player.cc
@@ -38,14 +38,14 @@ class FilePlayerImpl : public FilePlayer {
                                    uint32_t startPosition,
                                    float volumeScaling,
                                    uint32_t notification,
-                                   uint32_t stopPosition = 0,
-                                   const CodecInst* codecInst = NULL);
+                                   uint32_t stopPosition,
+                                   const CodecInst* codecInst);
   virtual int32_t StartPlayingFile(InStream& sourceStream,
                                    uint32_t startPosition,
                                    float volumeScaling,
                                    uint32_t notification,
-                                   uint32_t stopPosition = 0,
-                                   const CodecInst* codecInst = NULL);
+                                   uint32_t stopPosition,
+                                   const CodecInst* codecInst);
   virtual int32_t StopPlayingFile();
   virtual bool IsPlayingFile() const;
   virtual int32_t GetPlayoutPosition(uint32_t& durationMs);