Convert channel counts to size_t.

webrtc/modules/audio_coding/acm2/acm_codec_database.h

Index: webrtc/modules/audio_coding/acm2/acm_codec_database.h
diff --git a/webrtc/modules/audio_coding/acm2/acm_codec_database.h b/webrtc/modules/audio_coding/acm2/acm_codec_database.h
index 9e8723847490345ed8f0b9381173fdbab9e40df4..6c2db9cfc824076f7cd12447b3aafc4edcbd0dd8 100644
--- a/webrtc/modules/audio_coding/acm2/acm_codec_database.h
+++ b/webrtc/modules/audio_coding/acm2/acm_codec_database.h
@@ -48,7 +48,7 @@ class ACMCodecDB {
     int num_packet_sizes;
     int packet_sizes_samples[kMaxNumPacketSize];
     int basic_block_samples;
-    int channel_support;
+    size_t channel_support;
   };
 
   // Returns codec id from database, given the information received in the input
@@ -60,7 +60,7 @@ class ACMCodecDB {
   //   codec id if successful, otherwise < 0.
   static int CodecNumber(const CodecInst& codec_inst);
   static int CodecId(const CodecInst& codec_inst);
-  static int CodecId(const char* payload_name, int frequency, int channels);
+  static int CodecId(const char* payload_name, int frequency, size_t channels);
   static int ReceiverCodecNumber(const CodecInst& codec_inst);
 
   // Databases with information about the supported codecs