Update {virtual,override} to follow C++11 style in printing.

printing/printing_context_win.h

Index: printing/printing_context_win.h
diff --git a/printing/printing_context_win.h b/printing/printing_context_win.h
index 7ed8b27b54f2e504a1b7e8d316b1e623677dee7a..9dba3cadfef44e1c051957b8187c3321c7c74875 100644
--- a/printing/printing_context_win.h
+++ b/printing/printing_context_win.h
@@ -18,26 +18,26 @@ class PrintSettings;
 class PRINTING_EXPORT PrintingContextWin : public PrintingContext {
  public:
   explicit PrintingContextWin(Delegate* delegate);
-  virtual ~PrintingContextWin();
+  ~PrintingContextWin() override;
 
   // PrintingContext implementation.
-  virtual void AskUserForSettings(
+  void AskUserForSettings(
       int max_pages,
       bool has_selection,
       bool is_scripted,
       const PrintSettingsCallback& callback) override;
-  virtual Result UseDefaultSettings() override;
-  virtual gfx::Size GetPdfPaperSizeDeviceUnits() override;
-  virtual Result UpdatePrinterSettings(bool external_preview,
-                                       bool show_system_dialog) override;
-  virtual Result InitWithSettings(const PrintSettings& settings) override;
-  virtual Result NewDocument(const base::string16& document_name) override;
-  virtual Result NewPage() override;
-  virtual Result PageDone() override;
-  virtual Result DocumentDone() override;
-  virtual void Cancel() override;
-  virtual void ReleaseContext() override;
-  virtual gfx::NativeDrawingContext context() const override;
+  Result UseDefaultSettings() override;
+  gfx::Size GetPdfPaperSizeDeviceUnits() override;
+  Result UpdatePrinterSettings(bool external_preview,
+                               bool show_system_dialog) override;
+  Result InitWithSettings(const PrintSettings& settings) override;
+  Result NewDocument(const base::string16& document_name) override;
+  Result NewPage() override;
+  Result PageDone() override;
+  Result DocumentDone() override;
+  void Cancel() override;
+  void ReleaseContext() override;
+  gfx::NativeDrawingContext context() const override;
 
  protected:
   static HWND GetRootWindow(gfx::NativeView view);