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

chrome/installer/util/install_util.h

Index: chrome/installer/util/install_util.h
diff --git a/chrome/installer/util/install_util.h b/chrome/installer/util/install_util.h
index edc6e369b101162464d376318cd0fd902291dc9d..5a2696747a82736a8d49138774e3647a49f12e4f 100644
--- a/chrome/installer/util/install_util.h
+++ b/chrome/installer/util/install_util.h
@@ -165,7 +165,7 @@ class InstallUtil {
    public:
     explicit ValueEquals(const base::string16& value_to_match)
         : value_to_match_(value_to_match) { }
-    virtual bool Evaluate(const base::string16& value) const override;
+    bool Evaluate(const base::string16& value) const override;
    protected:
     base::string16 value_to_match_;
    private:
@@ -190,8 +190,8 @@ class InstallUtil {
   class ProgramCompare : public RegistryValuePredicate {
    public:
     explicit ProgramCompare(const base::FilePath& path_to_match);
-    virtual ~ProgramCompare();
-    virtual bool Evaluate(const base::string16& value) const override;
+    ~ProgramCompare() override;
+    bool Evaluate(const base::string16& value) const override;
     bool EvaluatePath(const base::FilePath& path) const;
 
    protected: