Modify PrinterSetupResult enum to constant style.

chrome/browser/ui/webui/print_preview/printer_backend_proxy_chromeos.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/print_preview/printer_backend_proxy.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/bind_helpers.h"
@@ skipping 113 matching lines @@
       return;
     }
 
     // Log printer configuration for selected printer.
     UMA_HISTOGRAM_ENUMERATION("Printing.CUPS.ProtocolUsed",
                               printer->GetProtocol(),
                               chromeos::Printer::kProtocolMax);
 
     if (prefs_->IsConfigurationCurrent(*printer)) {
       // Skip setup if the printer is already installed.
-      HandlePrinterSetup(std::move(printer), cb, chromeos::SUCCESS);
+      HandlePrinterSetup(std::move(printer), cb, chromeos::kSuccess);
       return;
     }
 
     const chromeos::Printer& printer_ref = *printer;
     printer_configurer_->SetUpPrinter(
         printer_ref,
         base::Bind(&PrinterBackendProxyChromeos::HandlePrinterSetup,
                    weak_factory_.GetWeakPtr(), base::Passed(&printer), cb));
   };
 
  private:
   void HandlePrinterSetup(std::unique_ptr<chromeos::Printer> printer,
                           const PrinterSetupCallback& cb,
                           chromeos::PrinterSetupResult result) {
     DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
     switch (result) {
-      case chromeos::PrinterSetupResult::SUCCESS:
+      case chromeos::PrinterSetupResult::kSuccess:
         VLOG(1) << "Printer setup successful for " << printer->id()
                 << " fetching properties";
         prefs_->PrinterInstalled(*printer);
 
         // fetch settings on the blocking pool and invoke callback.
         FetchCapabilities(std::move(printer), cb);
         return;
-      case chromeos::PrinterSetupResult::PPD_NOT_FOUND:
+      case chromeos::PrinterSetupResult::kPpdNotFound:
         LOG(WARNING) << "Could not find PPD.  Check printer configuration.";
         // Prompt user to update configuration.
         // TODO(skau): Fill me in
         break;
-      case chromeos::PrinterSetupResult::PPD_UNRETRIEVABLE:
+      case chromeos::PrinterSetupResult::kPpdUnretrievable:
         LOG(WARNING) << "Could not download PPD.  Check Internet connection.";
         // Could not download PPD.  Connect to Internet.
         // TODO(skau): Fill me in
         break;
-      case chromeos::PrinterSetupResult::PRINTER_UNREACHABLE:
-      case chromeos::PrinterSetupResult::DBUS_ERROR:
-      case chromeos::PrinterSetupResult::PPD_TOO_LARGE:
-      case chromeos::PrinterSetupResult::INVALID_PPD:
-      case chromeos::PrinterSetupResult::FATAL_ERROR:
+      case chromeos::PrinterSetupResult::kPrinterUnreachable:
+      case chromeos::PrinterSetupResult::kDbusError:
+      case chromeos::PrinterSetupResult::kPpdTooLarge:
+      case chromeos::PrinterSetupResult::kInvalidPpd:
+      case chromeos::PrinterSetupResult::kFatalError:
         LOG(ERROR) << "Unexpected error in printer setup." << result;
         break;
+      case chromeos::PrinterSetupResult::kMaxValue:
+        NOTREACHED() << "This value is not expected";
+        break;
     }
 
     // TODO(skau): Open printer settings if this is resolvable.
     cb.Run(nullptr);
   }
 
   chromeos::PrintersManager* prefs_;
   scoped_refptr<chromeos::printing::PpdProvider> ppd_provider_;
   std::unique_ptr<chromeos::PrinterConfigurer> printer_configurer_;
   base::WeakPtrFactory<PrinterBackendProxyChromeos> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PrinterBackendProxyChromeos);
 };
 
 }  // namespace
 
 std::unique_ptr<PrinterBackendProxy> PrinterBackendProxy::Create(
     Profile* profile) {
   return base::MakeUnique<PrinterBackendProxyChromeos>(profile);
 }
 
 }  // namespace printing