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

net/udp/udp_client_socket.cc

Index: net/udp/udp_client_socket.cc
diff --git a/net/udp/udp_client_socket.cc b/net/udp/udp_client_socket.cc
index bbc32d4f28e725f2461136b0f22bd9fe5490049d..f6f904a6beb9f72c448c15caf97572454637653c 100644
--- a/net/udp/udp_client_socket.cc
+++ b/net/udp/udp_client_socket.cc
@@ -46,11 +46,11 @@ int UDPClientSocket::GetLocalAddress(IPEndPoint* address) const {
   return socket_.GetLocalAddress(address);
 }
 
-bool UDPClientSocket::SetReceiveBufferSize(int32 size) {
+int UDPClientSocket::SetReceiveBufferSize(int32 size) {
   return socket_.SetReceiveBufferSize(size);
 }
 
-bool UDPClientSocket::SetSendBufferSize(int32 size) {
+int UDPClientSocket::SetSendBufferSize(int32 size) {
   return socket_.SetSendBufferSize(size);
 }