Standardize usage of virtual/override/final in chrome/browser/

chrome/browser/font_family_cache_unittest.cc

Index: chrome/browser/font_family_cache_unittest.cc
diff --git a/chrome/browser/font_family_cache_unittest.cc b/chrome/browser/font_family_cache_unittest.cc
index 0a28acf6699a708b54f4a28586f7c560be7c6ca4..b7f8925deb27039218b382cf2984b5aa38fe9830 100644
--- a/chrome/browser/font_family_cache_unittest.cc
+++ b/chrome/browser/font_family_cache_unittest.cc
@@ -15,9 +15,8 @@ class TestingFontFamilyCache : public FontFamilyCache {
  public:
   explicit TestingFontFamilyCache(Profile* profile)
       : FontFamilyCache(profile), fetch_font_count_(0) {}
-  virtual ~TestingFontFamilyCache() {}
-  virtual base::string16 FetchFont(const char* script,
-                                   const char* map_name) override {
+  ~TestingFontFamilyCache() override {}
+  base::string16 FetchFont(const char* script, const char* map_name) override {
     ++fetch_font_count_;
     return FontFamilyCache::FetchFont(script, map_name);
   }