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

content/browser/renderer_host/pepper/pepper_file_io_host.h

Index: content/browser/renderer_host/pepper/pepper_file_io_host.h
diff --git a/content/browser/renderer_host/pepper/pepper_file_io_host.h b/content/browser/renderer_host/pepper/pepper_file_io_host.h
index 4930535731e1d67f10c6e8f4baf2d005eb95aece..36f7dba09a49c5f9346cba3eec66a87cdddbc0fc 100644
--- a/content/browser/renderer_host/pepper/pepper_file_io_host.h
+++ b/content/browser/renderer_host/pepper/pepper_file_io_host.h
@@ -38,10 +38,10 @@ class PepperFileIOHost : public ppapi::host::ResourceHost,
   PepperFileIOHost(BrowserPpapiHostImpl* host,
                    PP_Instance instance,
                    PP_Resource resource);
-  virtual ~PepperFileIOHost();
+  ~PepperFileIOHost() override;
 
   // ppapi::host::ResourceHost override.
-  virtual int32_t OnResourceMessageReceived(
+  int32_t OnResourceMessageReceived(
       const IPC::Message& msg,
       ppapi::host::HostMessageContext* context) override;