Clean up Cloud Print API flow code.

chrome/browser/printing/cloud_print/cloud_print_printer_list.h

Index: chrome/browser/printing/cloud_print/cloud_print_printer_list.h
diff --git a/chrome/browser/printing/cloud_print/cloud_print_printer_list.h b/chrome/browser/printing/cloud_print/cloud_print_printer_list.h
index abfadf5eb7aed795ea5d14cb53ebb79fd17683a0..f06a0c777f31558b071ed0d2c471a7098b92d32c 100644
--- a/chrome/browser/printing/cloud_print/cloud_print_printer_list.h
+++ b/chrome/browser/printing/cloud_print/cloud_print_printer_list.h
@@ -16,14 +16,11 @@ namespace cloud_print {
 class CloudPrintPrinterList : public CloudPrintApiFlowRequest {
  public:
   struct Device {
-    Device();
-    ~Device();
-
     std::string id;
     std::string display_name;
     std::string description;
   };
-  typedef std::vector<Device> DeviceList;
+  using DeviceList = std::vector<Device>;
 
   class Delegate {
    public:
@@ -37,17 +34,16 @@ class CloudPrintPrinterList : public CloudPrintApiFlowRequest {
   explicit CloudPrintPrinterList(Delegate* delegate);
   ~CloudPrintPrinterList() override;
 
+  // CloudPrintApiFlowRequest implementation:
   void OnGCDApiFlowError(GCDApiFlow::Status status) override;
-
   void OnGCDApiFlowComplete(const base::DictionaryValue& value) override;
-
   GURL GetURL() override;
 
  private:
   bool FillPrinterDetails(const base::DictionaryValue& printer_value,
                           Device* printer_details);
 
-  Delegate* delegate_;
+  Delegate* const delegate_;
 };
 
 }  // namespace cloud_print