Standardize usage of virtual/override/final in content/

content/utility/in_process_utility_thread.h

Index: content/utility/in_process_utility_thread.h
diff --git a/content/utility/in_process_utility_thread.h b/content/utility/in_process_utility_thread.h
index 606c6d299f8c197e93ce8f5545b1ae231556ad82..00c71a1dd282183fcf5679a4ac60f7355794d6c5 100644
--- a/content/utility/in_process_utility_thread.h
+++ b/content/utility/in_process_utility_thread.h
@@ -17,12 +17,12 @@ class ChildProcess;
 class InProcessUtilityThread : public base::Thread {
  public:
   InProcessUtilityThread(const std::string& channel_id);
-  virtual ~InProcessUtilityThread();
+  ~InProcessUtilityThread() override;
 
  private:
   // base::Thread implementation:
-  virtual void Init() override;
-  virtual void CleanUp() override;
+  void Init() override;
+  void CleanUp() override;
 
   void InitInternal();