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

chrome/installer/util/chrome_browser_sxs_operations.h

Index: chrome/installer/util/chrome_browser_sxs_operations.h
diff --git a/chrome/installer/util/chrome_browser_sxs_operations.h b/chrome/installer/util/chrome_browser_sxs_operations.h
index f60a4850c21fafe81e6932f138a788a2cc0c275e..06893f107896cadf44048a09137cca8843c6c9b6 100644
--- a/chrome/installer/util/chrome_browser_sxs_operations.h
+++ b/chrome/installer/util/chrome_browser_sxs_operations.h
@@ -16,11 +16,11 @@ class ChromeBrowserSxSOperations : public ChromeBrowserOperations {
  public:
   ChromeBrowserSxSOperations() {}
 
-  virtual void AppendProductFlags(const std::set<base::string16>& options,
-                                  base::CommandLine* cmd_line) const override;
+  void AppendProductFlags(const std::set<base::string16>& options,
+                          base::CommandLine* cmd_line) const override;
 
-  virtual void AppendRenameFlags(const std::set<base::string16>& options,
-                                 base::CommandLine* cmd_line) const override;
+  void AppendRenameFlags(const std::set<base::string16>& options,
+                         base::CommandLine* cmd_line) const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserSxSOperations);