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

android_webview/native/aw_dev_tools_server.cc

Index: android_webview/native/aw_dev_tools_server.cc
diff --git a/android_webview/native/aw_dev_tools_server.cc b/android_webview/native/aw_dev_tools_server.cc
index 9c9669429d7ef67f9e3df1315c203cb94bbb85cb..52d474ed0ca7f9da4549d4bb9a75d70a9d229e69 100644
--- a/android_webview/native/aw_dev_tools_server.cc
+++ b/android_webview/native/aw_dev_tools_server.cc
@@ -42,7 +42,7 @@ class AwDevToolsServerDelegate : public content::DevToolsHttpHandlerDelegate {
   AwDevToolsServerDelegate() {
   }
 
-  virtual ~AwDevToolsServerDelegate() {}
+  ~AwDevToolsServerDelegate() override {}
 
   // DevToolsHttpProtocolHandler::Delegate overrides.
   std::string GetDiscoveryPageHTML() override;
@@ -81,7 +81,7 @@ class UnixDomainServerSocketFactory
 
  private:
   // content::DevToolsHttpHandler::ServerSocketFactory.
-  virtual scoped_ptr<net::ServerSocket> CreateForHttpServer() override {
+  scoped_ptr<net::ServerSocket> CreateForHttpServer() override {
     scoped_ptr<net::ServerSocket> socket(
         new net::UnixDomainServerSocket(
             base::Bind(&content::CanUserConnectToDevTools),