Standardize usage of virtual/override/final in content/renderer/

content/renderer/in_process_renderer_thread.h

Index: content/renderer/in_process_renderer_thread.h
diff --git a/content/renderer/in_process_renderer_thread.h b/content/renderer/in_process_renderer_thread.h
index 56b4a8b27093723d564533ad4f7a6e905a63f84b..4b4bc65608f4b56abd598fe78a73528d7913e49f 100644
--- a/content/renderer/in_process_renderer_thread.h
+++ b/content/renderer/in_process_renderer_thread.h
@@ -18,11 +18,11 @@ class RenderProcess;
 class InProcessRendererThread : public base::Thread {
  public:
   explicit InProcessRendererThread(const std::string& channel_id);
-  virtual ~InProcessRendererThread();
+  ~InProcessRendererThread() override;
 
  protected:
-  virtual void Init() override;
-  virtual void CleanUp() override;
+  void Init() override;
+  void CleanUp() override;
 
  private:
   std::string channel_id_;