Standardize usage of virtual/override/final in chrome/browser/extensions/

chrome/browser/extensions/api/idle/idle_api_unittest.cc

Index: chrome/browser/extensions/api/idle/idle_api_unittest.cc
diff --git a/chrome/browser/extensions/api/idle/idle_api_unittest.cc b/chrome/browser/extensions/api/idle/idle_api_unittest.cc
index 52edd522a040b9a858d82a372fd1c2b24ae3c96e..d21b7d97e5231c8dca3482eb3a027d3885e7f525 100644
--- a/chrome/browser/extensions/api/idle/idle_api_unittest.cc
+++ b/chrome/browser/extensions/api/idle/idle_api_unittest.cc
@@ -42,11 +42,10 @@ class MockEventDelegate : public IdleManager::EventDelegate {
 class TestIdleProvider : public IdleManager::IdleTimeProvider {
  public:
   TestIdleProvider();
-  virtual ~TestIdleProvider();
-  virtual void CalculateIdleState(int idle_threshold,
-                                  IdleCallback notify) override;
-  virtual void CalculateIdleTime(IdleTimeCallback notify) override;
-  virtual bool CheckIdleStateIsLocked() override;
+  ~TestIdleProvider() override;
+  void CalculateIdleState(int idle_threshold, IdleCallback notify) override;
+  void CalculateIdleTime(IdleTimeCallback notify) override;
+  bool CheckIdleStateIsLocked() override;
 
   void set_idle_time(int idle_time);
   void set_locked(bool locked);