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

net/socket/socks_client_socket.cc

Index: net/socket/socks_client_socket.cc
diff --git a/net/socket/socks_client_socket.cc b/net/socket/socks_client_socket.cc
index 654509210a4c04d1133cc4627028a15472f97072..f7c69f28fd6ccdb26cf65017f090e26eaa31cca9 100644
--- a/net/socket/socks_client_socket.cc
+++ b/net/socket/socks_client_socket.cc
@@ -211,11 +211,11 @@ int SOCKSClientSocket::Write(IOBuffer* buf, int buf_len,
   return rv;
 }
 
-bool SOCKSClientSocket::SetReceiveBufferSize(int32 size) {
+int SOCKSClientSocket::SetReceiveBufferSize(int32 size) {
   return transport_->socket()->SetReceiveBufferSize(size);
 }
 
-bool SOCKSClientSocket::SetSendBufferSize(int32 size) {
+int SOCKSClientSocket::SetSendBufferSize(int32 size) {
   return transport_->socket()->SetSendBufferSize(size);
 }