Revert^2 "Use std::function instead of base::function_ref"

84b7cff1a7082d32e9043014e57db7b4ed2aa7a0

Test: m
Bug: 302723053
Change-Id: If25bdb65254a4a8ad5afeda7e6ce1eedf422d896
diff --git a/libs/binder/RpcTransportUtils.h b/libs/binder/RpcTransportUtils.h
index 32f0db8..a0e502e 100644
--- a/libs/binder/RpcTransportUtils.h
+++ b/libs/binder/RpcTransportUtils.h
@@ -27,7 +27,7 @@
 status_t interruptableReadOrWrite(
         const android::RpcTransportFd& socket, FdTrigger* fdTrigger, iovec* iovs, int niovs,
         SendOrReceive sendOrReceiveFun, const char* funName, int16_t event,
-        const std::optional<android::base::function_ref<status_t()>>& altPoll) {
+        const std::optional<binder::impl::SmallFunction<status_t()>>& altPoll) {
     MAYBE_WAIT_IN_FLAKE_MODE;
 
     if (niovs < 0) {