Enable copy and assignment for Printer objects.

chromeos/printing/printer_configuration.cc

Index: chromeos/printing/printer_configuration.cc
diff --git a/chromeos/printing/printer_configuration.cc b/chromeos/printing/printer_configuration.cc
index 35b9aa4f0bfef8d29825843218ac53a0401a2e1b..2eb7bf91c63d0d8c870e3aa6d99e78b62f4519bf 100644
--- a/chromeos/printing/printer_configuration.cc
+++ b/chromeos/printing/printer_configuration.cc
@@ -12,6 +12,10 @@ Printer::Printer() {}
 
 Printer::Printer(const std::string& id) : id_(id) {}
 
+Printer::Printer(const Printer& other) = default;
+
+Printer& Printer::operator=(const Printer& other) = default;
+
 Printer::~Printer() {}
 
 void Printer::SetPPD(std::unique_ptr<Printer::PPDFile> ppd) {