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

chrome/browser/devtools/devtools_embedder_message_dispatcher.cc

Index: chrome/browser/devtools/devtools_embedder_message_dispatcher.cc
diff --git a/chrome/browser/devtools/devtools_embedder_message_dispatcher.cc b/chrome/browser/devtools/devtools_embedder_message_dispatcher.cc
index daf2a09db29bbfc080fb0a5990329b5d09184f17..5e0193762a5f1a7771a869084945aa7645f29f05 100644
--- a/chrome/browser/devtools/devtools_embedder_message_dispatcher.cc
+++ b/chrome/browser/devtools/devtools_embedder_message_dispatcher.cc
@@ -151,11 +151,11 @@ bool ParseAndHandle4(const base::Callback<void(A1, A2, A3, A4)>& handler,
  */
 class DispatcherImpl : public DevToolsEmbedderMessageDispatcher {
  public:
-  virtual ~DispatcherImpl() {}
+  ~DispatcherImpl() override {}
 
-  virtual bool Dispatch(const std::string& method,
-                        const base::ListValue* params,
-                        std::string* error) override {
+  bool Dispatch(const std::string& method,
+                const base::ListValue* params,
+                std::string* error) override {
     HandlerMap::iterator it = handlers_.find(method);
     if (it == handlers_.end())
       return false;