Pepper: Remove unused interface versions.

ppapi/cpp/dev/audio_input_dev.h

Index: ppapi/cpp/dev/audio_input_dev.h
diff --git a/ppapi/cpp/dev/audio_input_dev.h b/ppapi/cpp/dev/audio_input_dev.h
index cb1f4ef6cd387c0f50c3b1e1748a8b5c85d381a7..a6e5a544ca56d044ad1bd36c5aa16b36ad9d90c1 100644
--- a/ppapi/cpp/dev/audio_input_dev.h
+++ b/ppapi/cpp/dev/audio_input_dev.h
@@ -50,10 +50,10 @@ class AudioInput_Dev : public Resource {
                void* user_data,
                const CompletionCallback& callback);
 
-  /// Requires <code>PPB_AudioInput_Dev</code> version 0.2 or 0.3.
+  /// Requires <code>PPB_AudioInput_Dev</code> version 0.3.
   int32_t Open(const DeviceRef_Dev& device_ref,
                const AudioConfig& config,
-               PPB_AudioInput_Callback_0_2 audio_input_callback_0_2,
+               PPB_AudioInput_Callback_0_3 audio_input_callback_0_3,
                void* user_data,
                const CompletionCallback& callback);