NaCl: Fix Chromium style warnings in src/trusted/plugin/

ppapi/native_client/src/trusted/plugin/module_ppapi.h

Index: ppapi/native_client/src/trusted/plugin/module_ppapi.h
diff --git a/ppapi/native_client/src/trusted/plugin/module_ppapi.h b/ppapi/native_client/src/trusted/plugin/module_ppapi.h
index ee7bd1980eeb2003d900174ba834c39d74669189..9e520a1c535077bb6677ad25e142c1cdac249f0a 100644
--- a/ppapi/native_client/src/trusted/plugin/module_ppapi.h
+++ b/ppapi/native_client/src/trusted/plugin/module_ppapi.h
@@ -13,11 +13,11 @@ class ModulePpapi : public pp::Module {
  public:
   ModulePpapi();
 
-  virtual ~ModulePpapi();
+  ~ModulePpapi() override;
 
-  virtual bool Init();
+  bool Init() override;
 
-  virtual pp::Instance* CreateInstance(PP_Instance pp_instance);
+  pp::Instance* CreateInstance(PP_Instance pp_instance) override;
 
  private:
   bool init_was_successful_;