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

jingle/glue/pseudotcp_adapter.cc

Index: jingle/glue/pseudotcp_adapter.cc
diff --git a/jingle/glue/pseudotcp_adapter.cc b/jingle/glue/pseudotcp_adapter.cc
index afd6c36909a027e165898ea41f704100f2e39014..cdb44a050e671c2c829d46b95fdabdd0768dd8ec 100644
--- a/jingle/glue/pseudotcp_adapter.cc
+++ b/jingle/glue/pseudotcp_adapter.cc
@@ -484,18 +484,18 @@ int PseudoTcpAdapter::Write(net::IOBuffer* buffer, int buffer_size,
   return core_->Write(buffer, buffer_size, callback);
 }
 
-bool PseudoTcpAdapter::SetReceiveBufferSize(int32 size) {
+int PseudoTcpAdapter::SetReceiveBufferSize(int32 size) {
   DCHECK(CalledOnValidThread());
 
   core_->SetReceiveBufferSize(size);
-  return false;
+  return net::OK;
 }
 
-bool PseudoTcpAdapter::SetSendBufferSize(int32 size) {
+int PseudoTcpAdapter::SetSendBufferSize(int32 size) {
   DCHECK(CalledOnValidThread());
 
   core_->SetSendBufferSize(size);
-  return false;
+  return net::OK;
 }
 
 int PseudoTcpAdapter::Connect(const net::CompletionCallback& callback) {