[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_coding/main/acm2/acm_codec_database.h

Index: webrtc/modules/audio_coding/main/acm2/acm_codec_database.h
diff --git a/webrtc/modules/audio_coding/main/acm2/acm_codec_database.h b/webrtc/modules/audio_coding/main/acm2/acm_codec_database.h
index b1ae5aa0f56b9dc0087f14e8f797af914ada1a83..88147b1a9d36edbfa2032a129559bb2e46b5d795 100644
--- a/webrtc/modules/audio_coding/main/acm2/acm_codec_database.h
+++ b/webrtc/modules/audio_coding/main/acm2/acm_codec_database.h
@@ -151,7 +151,7 @@ class ACMCodecDB {
     int num_packet_sizes;
     int packet_sizes_samples[kMaxNumPacketSize];
     int basic_block_samples;
-    int channel_support;
+    size_t channel_support;
     bool owns_decoder;
   };
 
@@ -175,7 +175,7 @@ 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);
 
   // Returns the codec sampling frequency for codec with id = "codec_id" in