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

chrome/browser/extensions/api/automation/automation_apitest.cc

Index: chrome/browser/extensions/api/automation/automation_apitest.cc
diff --git a/chrome/browser/extensions/api/automation/automation_apitest.cc b/chrome/browser/extensions/api/automation/automation_apitest.cc
index 3a7769c385a07dc844fb1f0596400fa429eb4579..4310f03bd5a46c47771dcc3838d2ff5459a5c330 100644
--- a/chrome/browser/extensions/api/automation/automation_apitest.cc
+++ b/chrome/browser/extensions/api/automation/automation_apitest.cc
@@ -64,7 +64,7 @@ class AutomationApiTest : public ExtensionApiTest {
   }
 
  public:
-  virtual void SetUpInProcessBrowserTestFixture() override {
+  void SetUpInProcessBrowserTestFixture() override {
     ExtensionApiTest::SetUpInProcessBrowserTestFixture();
   }
 };