Update audio code to use size_t more correctly,

webrtc/modules/audio_coding/neteq/packet_buffer.cc

Index: webrtc/modules/audio_coding/neteq/packet_buffer.cc
diff --git a/webrtc/modules/audio_coding/neteq/packet_buffer.cc b/webrtc/modules/audio_coding/neteq/packet_buffer.cc
index 07fa339fd30b9a2b0230658b116183d7970732ee..b3b445be8e3fee75e7019179ea61cd844572b13d 100644
--- a/webrtc/modules/audio_coding/neteq/packet_buffer.cc
+++ b/webrtc/modules/audio_coding/neteq/packet_buffer.cc
@@ -178,7 +178,7 @@ const RTPHeader* PacketBuffer::NextRtpHeader() const {
   return const_cast<const RTPHeader*>(&(buffer_.front()->header));
 }
 
-Packet* PacketBuffer::GetNextPacket(int* discard_count) {
+Packet* PacketBuffer::GetNextPacket(size_t* discard_count) {
   if (Empty()) {
     // Buffer is empty.
     return NULL;
@@ -191,7 +191,7 @@ Packet* PacketBuffer::GetNextPacket(int* discard_count) {
 
   // Discard other packets with the same timestamp. These are duplicates or
   // redundant payloads that should not be used.
-  int discards = 0;
+  size_t discards = 0;
 
   while (!Empty() &&
       buffer_.front()->header.timestamp == packet->header.timestamp) {
@@ -237,15 +237,15 @@ int PacketBuffer::DiscardAllOldPackets(uint32_t timestamp_limit) {
   return DiscardOldPackets(timestamp_limit, 0);
 }
 
-int PacketBuffer::NumPacketsInBuffer() const {
-  return static_cast<int>(buffer_.size());
+size_t PacketBuffer::NumPacketsInBuffer() const {
+  return buffer_.size();
 }
 
-int PacketBuffer::NumSamplesInBuffer(DecoderDatabase* decoder_database,
-                                     int last_decoded_length) const {
+size_t PacketBuffer::NumSamplesInBuffer(DecoderDatabase* decoder_database,
+                                        size_t last_decoded_length) const {
   PacketList::const_iterator it;
-  int num_samples = 0;
-  int last_duration = last_decoded_length;
+  size_t num_samples = 0;
+  size_t last_duration = last_decoded_length;
   for (it = buffer_.begin(); it != buffer_.end(); ++it) {
     Packet* packet = (*it);
     AudioDecoder* decoder =