make SetReceiveBufferSize and SetSendBufferSize return net error codes (instead of bools)

jingle/glue/channel_socket_adapter.cc

Index: jingle/glue/channel_socket_adapter.cc
diff --git a/jingle/glue/channel_socket_adapter.cc b/jingle/glue/channel_socket_adapter.cc
index 40ed12c7cd9856a184426d46c7645acd3073e7c1..bca4222aaeb0421d079c8de099137a22c8f516b5 100644
--- a/jingle/glue/channel_socket_adapter.cc
+++ b/jingle/glue/channel_socket_adapter.cc
@@ -99,14 +99,16 @@ int TransportChannelSocketAdapter::Write(
   return result;
 }
 
-bool TransportChannelSocketAdapter::SetReceiveBufferSize(int32 size) {
+int TransportChannelSocketAdapter::SetReceiveBufferSize(int32 size) {
   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
-  return channel_->SetOption(talk_base::Socket::OPT_RCVBUF, size) == 0;
+  return (channel_->SetOption(talk_base::Socket::OPT_RCVBUF, size) == 0) ?
+      net::OK : net::ERR_SOCKET_SET_RECEIVE_BUFFER_SIZE_ERROR;
 }
 
-bool TransportChannelSocketAdapter::SetSendBufferSize(int32 size) {
+int TransportChannelSocketAdapter::SetSendBufferSize(int32 size) {
   DCHECK_EQ(base::MessageLoop::current(), message_loop_);
-  return channel_->SetOption(talk_base::Socket::OPT_SNDBUF, size) == 0;
+  return (channel_->SetOption(talk_base::Socket::OPT_SNDBUF, size) == 0) ?
+      net::OK : net::ERR_SOCKET_SET_SEND_BUFFER_SIZE_ERROR;
 }
 
 void TransportChannelSocketAdapter::Close(int error_code) {