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

content/browser/renderer_host/pepper/pepper_file_ref_host.h

Index: content/browser/renderer_host/pepper/pepper_file_ref_host.h
diff --git a/content/browser/renderer_host/pepper/pepper_file_ref_host.h b/content/browser/renderer_host/pepper/pepper_file_ref_host.h
index 60e814b6a1801b15425a2b16dae6154d7dcb35ed..5f6d11eb119a11979559dd946e3e331ed15e313e 100644
--- a/content/browser/renderer_host/pepper/pepper_file_ref_host.h
+++ b/content/browser/renderer_host/pepper/pepper_file_ref_host.h
@@ -65,13 +65,13 @@ class CONTENT_EXPORT PepperFileRefHost
                     PP_Resource resource,
                     const base::FilePath& external_path);
 
-  virtual ~PepperFileRefHost();
+  ~PepperFileRefHost() override;
 
   // ResourceHost overrides.
-  virtual int32_t OnResourceMessageReceived(
+  int32_t OnResourceMessageReceived(
       const IPC::Message& msg,
       ppapi::host::HostMessageContext* context) override;
-  virtual bool IsFileRefHost() override;
+  bool IsFileRefHost() override;
 
   // Required to support Rename().
   PP_FileSystemType GetFileSystemType() const;