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

chrome/renderer/translate/translate_helper_browsertest.cc

Index: chrome/renderer/translate/translate_helper_browsertest.cc
diff --git a/chrome/renderer/translate/translate_helper_browsertest.cc b/chrome/renderer/translate/translate_helper_browsertest.cc
index 3c0db278d2a13f2560314a1c841d4f7fcb1a0c8a..4c22f802a8eeb47f4bbc09722891cc514e67ee26 100644
--- a/chrome/renderer/translate/translate_helper_browsertest.cc
+++ b/chrome/renderer/translate/translate_helper_browsertest.cc
@@ -28,7 +28,7 @@ class TestTranslateHelper : public translate::TranslateHelper {
             extensions::EXTENSION_GROUP_INTERNAL_TRANSLATE_SCRIPTS,
             extensions::kExtensionScheme) {}
 
-  virtual base::TimeDelta AdjustDelay(int delayInMs) override {
+  base::TimeDelta AdjustDelay(int delayInMs) override {
     // Just returns base::TimeDelta() which has initial value 0.
     // Tasks doesn't need to be delayed in tests.
     return base::TimeDelta();