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

content/browser/appcache/appcache_interceptor.cc

Index: content/browser/appcache/appcache_interceptor.cc
diff --git a/content/browser/appcache/appcache_interceptor.cc b/content/browser/appcache/appcache_interceptor.cc
index 1510c640645400e4cf006fd48cfb8e47ac931c2b..adc6d2c69798e1e33aef3444221a9706c06cf964 100644
--- a/content/browser/appcache/appcache_interceptor.cc
+++ b/content/browser/appcache/appcache_interceptor.cc
@@ -17,8 +17,8 @@ class AppCacheInterceptor::StartInterceptor
     : public net::URLRequestInterceptor {
  public:
   StartInterceptor() {}
-  virtual ~StartInterceptor() {}
-  virtual net::URLRequestJob* MaybeInterceptRequest(
+  ~StartInterceptor() override {}
+  net::URLRequestJob* MaybeInterceptRequest(
       net::URLRequest* request,
       net::NetworkDelegate* network_delegate) const override {
     AppCacheRequestHandler* handler = GetHandler(request);