--- a/toolkit/components/mediasniffer/nsMediaSniffer.cpp
+++ b/toolkit/components/mediasniffer/nsMediaSniffer.cpp
@@ -13,17 +13,16 @@
 
 #include "nsIClassInfoImpl.h"
 
 // The minimum number of bytes that are needed to attempt to sniff an mp4 file.
 static const unsigned MP4_MIN_BYTES_COUNT = 12;
 // The maximum number of bytes to consider when attempting to sniff a file.
 static const PRUint32 MAX_BYTES_SNIFFED = 512;
 
-NS_IMPL_CLASSINFO(nsMediaSniffer, NULL, 0, NS_MEDIA_SNIFFER_CID)
 NS_IMPL_ISUPPORTS1(nsMediaSniffer, nsIContentSniffer)
 
 nsMediaSniffer::nsMediaSnifferEntry nsMediaSniffer::sSnifferEntries[] = {
   // The string OggS, followed by the null byte.
   PATTERN_ENTRY("\xFF\xFF\xFF\xFF\xFF", "OggS", APPLICATION_OGG),
   // The string RIFF, followed by four bytes, followed by the string WAVE
   PATTERN_ENTRY("\xFF\xFF\xFF\xFF\x00\x00\x00\x00\xFF\xFF\xFF\xFF", "RIFF\x00\x00\x00\x00WAVE", AUDIO_WAV),
   // WebM