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

android_webview/native/aw_http_auth_handler.h

Index: android_webview/native/aw_http_auth_handler.h
diff --git a/android_webview/native/aw_http_auth_handler.h b/android_webview/native/aw_http_auth_handler.h
index c063702a3e58def6fe250c200113044bb8147ed0..79b7406ec2c6e4521565214bb618320e4717037c 100644
--- a/android_webview/native/aw_http_auth_handler.h
+++ b/android_webview/native/aw_http_auth_handler.h
@@ -32,10 +32,10 @@ class AwHttpAuthHandler : public AwHttpAuthHandlerBase {
   AwHttpAuthHandler(AwLoginDelegate* login_delegate,
                     net::AuthChallengeInfo* auth_info,
                     bool first_auth_attempt);
-  virtual ~AwHttpAuthHandler();
+  ~AwHttpAuthHandler() override;
 
   // from AwHttpAuthHandler
-  virtual bool HandleOnUIThread(content::WebContents* web_contents) override;
+  bool HandleOnUIThread(content::WebContents* web_contents) override;
 
   void Proceed(JNIEnv* env, jobject obj, jstring username, jstring password);
   void Cancel(JNIEnv* env, jobject obj);