Replace OVERRIDE with its C++11 counterparts in src/printing

printing/backend/print_backend_win.cc

Index: printing/backend/print_backend_win.cc
diff --git a/printing/backend/print_backend_win.cc b/printing/backend/print_backend_win.cc
index 6c6bd69b9bee7426df7bbe42bb6a97f26c58e794..0f5d0964c050933570169a60dba4a766845e6175 100644
--- a/printing/backend/print_backend_win.cc
+++ b/printing/backend/print_backend_win.cc
@@ -157,17 +157,17 @@ class PrintBackendWin : public PrintBackend {
   PrintBackendWin() {}
 
   // PrintBackend implementation.
-  virtual bool EnumeratePrinters(PrinterList* printer_list) OVERRIDE;
-  virtual std::string GetDefaultPrinterName() OVERRIDE;
+  virtual bool EnumeratePrinters(PrinterList* printer_list) override;
+  virtual std::string GetDefaultPrinterName() override;
   virtual bool GetPrinterSemanticCapsAndDefaults(
       const std::string& printer_name,
-      PrinterSemanticCapsAndDefaults* printer_info) OVERRIDE;
+      PrinterSemanticCapsAndDefaults* printer_info) override;
   virtual bool GetPrinterCapsAndDefaults(
       const std::string& printer_name,
-      PrinterCapsAndDefaults* printer_info) OVERRIDE;
+      PrinterCapsAndDefaults* printer_info) override;
   virtual std::string GetPrinterDriverInfo(
-      const std::string& printer_name) OVERRIDE;
-  virtual bool IsValidPrinter(const std::string& printer_name) OVERRIDE;
+      const std::string& printer_name) override;
+  virtual bool IsValidPrinter(const std::string& printer_name) override;
 
  protected:
   virtual ~PrintBackendWin() {}