Standardize usage of virtual/override/final in printing/

printing/backend/print_backend_cups.cc

Index: printing/backend/print_backend_cups.cc
diff --git a/printing/backend/print_backend_cups.cc b/printing/backend/print_backend_cups.cc
index e672b895944b53480eca91a9d23e682f739bddce..58ae20f85b2e99982bd496f2aff81c2c9050812d 100644
--- a/printing/backend/print_backend_cups.cc
+++ b/printing/backend/print_backend_cups.cc
@@ -34,20 +34,18 @@ class PrintBackendCUPS : public PrintBackend {
                    http_encryption_t encryption, bool blocking);
 
   // PrintBackend implementation.
-  virtual bool EnumeratePrinters(PrinterList* printer_list) override;
-  virtual std::string GetDefaultPrinterName() override;
-  virtual bool GetPrinterSemanticCapsAndDefaults(
+  bool EnumeratePrinters(PrinterList* printer_list) override;
+  std::string GetDefaultPrinterName() override;
+  bool GetPrinterSemanticCapsAndDefaults(
       const std::string& printer_name,
       PrinterSemanticCapsAndDefaults* printer_info) override;
-  virtual bool GetPrinterCapsAndDefaults(
-      const std::string& printer_name,
-      PrinterCapsAndDefaults* printer_info) override;
-  virtual std::string GetPrinterDriverInfo(
-      const std::string& printer_name) override;
-  virtual bool IsValidPrinter(const std::string& printer_name) override;
+  bool GetPrinterCapsAndDefaults(const std::string& printer_name,
+                                 PrinterCapsAndDefaults* printer_info) override;
+  std::string GetPrinterDriverInfo(const std::string& printer_name) override;
+  bool IsValidPrinter(const std::string& printer_name) override;
 
  protected:
-  virtual ~PrintBackendCUPS() {}
+  ~PrintBackendCUPS() override {}
 
  private:
   // Following functions are wrappers around corresponding CUPS functions.