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

jingle/glue/proxy_resolving_client_socket.cc

Index: jingle/glue/proxy_resolving_client_socket.cc
diff --git a/jingle/glue/proxy_resolving_client_socket.cc b/jingle/glue/proxy_resolving_client_socket.cc
index f0b98d0bcc9560972cf0f2dd82a4e0f8024b0d12..d6d17867e04efe7ebe4305877f77e4c76b2cc222 100644
--- a/jingle/glue/proxy_resolving_client_socket.cc
+++ b/jingle/glue/proxy_resolving_client_socket.cc
@@ -107,18 +107,18 @@ int ProxyResolvingClientSocket::Write(
   return net::ERR_SOCKET_NOT_CONNECTED;
 }
 
-bool ProxyResolvingClientSocket::SetReceiveBufferSize(int32 size) {
+int ProxyResolvingClientSocket::SetReceiveBufferSize(int32 size) {
   if (transport_.get() && transport_->socket())
     return transport_->socket()->SetReceiveBufferSize(size);
   NOTREACHED();
-  return false;
+  return net::ERR_SOCKET_NOT_CONNECTED;
 }
 
-bool ProxyResolvingClientSocket::SetSendBufferSize(int32 size) {
+int ProxyResolvingClientSocket::SetSendBufferSize(int32 size) {
   if (transport_.get() && transport_->socket())
     return transport_->socket()->SetSendBufferSize(size);
   NOTREACHED();
-  return false;
+  return net::ERR_SOCKET_NOT_CONNECTED;
 }
 
 int ProxyResolvingClientSocket::Connect(