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

chrome/browser/download/download_browsertest.cc

Index: chrome/browser/download/download_browsertest.cc
diff --git a/chrome/browser/download/download_browsertest.cc b/chrome/browser/download/download_browsertest.cc
index cc4bb5984dea7468d05cb1157d9826e641ece2cf..39caea3ca4b585e2fd71affb68ebae2e15149909 100644
--- a/chrome/browser/download/download_browsertest.cc
+++ b/chrome/browser/download/download_browsertest.cc
@@ -3427,9 +3427,9 @@ class DisableSafeBrowsingOnInProgressDownload
         final_state_seen_(false) {
     Init();
   }
-  virtual ~DisableSafeBrowsingOnInProgressDownload() {}
+  ~DisableSafeBrowsingOnInProgressDownload() override {}
 
-  virtual bool IsDownloadInFinalState(DownloadItem* download) override {
+  bool IsDownloadInFinalState(DownloadItem* download) override {
     if (download->GetState() != DownloadItem::IN_PROGRESS ||
         download->GetTargetFilePath().empty())
       return false;