content: Remove unused speex related code.

content/browser/speech/audio_encoder.h

Index: content/browser/speech/audio_encoder.h
diff --git a/content/browser/speech/audio_encoder.h b/content/browser/speech/audio_encoder.h
index 581eafd2af53f5a385c7145ed44c75c1cd2d9e32..5bfdce7a28cf4560fd16725ce550c9f47d8c72e3 100644
--- a/content/browser/speech/audio_encoder.h
+++ b/content/browser/speech/audio_encoder.h
@@ -15,18 +15,10 @@
 namespace content{
 class AudioChunk;
 
-// Provides a simple interface to encode raw audio using the various speech
-// codecs.
+// Provides a simple interface to encode raw audio using FLAC codec.
 class AudioEncoder {
  public:
-  enum Codec {
-    CODEC_FLAC,
-    CODEC_SPEEX,
-  };
-
-  static AudioEncoder* Create(Codec codec,
-                              int sampling_rate,
-                              int bits_per_sample);
+  static AudioEncoder* Create(int sampling_rate, int bits_per_sample);
 
   virtual ~AudioEncoder();