Update {virtual,override} to follow C++11 style in ppapi.

ppapi/shared_impl/private/ppb_x509_certificate_private_shared.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PPAPI_SHARED_IMPL_PRIVATE_PPB_X509_CERTIFICATE_PRIVATE_IMPL_H_
 #define PPAPI_SHARED_IMPL_PRIVATE_PPB_X509_CERTIFICATE_PRIVATE_IMPL_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 31 matching lines @@
     : public thunk::PPB_X509Certificate_Private_API,
       public Resource {
  public:
   PPB_X509Certificate_Private_Shared(ResourceObjectType type,
                                      PP_Instance instance);
   // Used by tcp_socket_shared_impl to construct a certificate resource from a
   // server certificate.
   PPB_X509Certificate_Private_Shared(ResourceObjectType type,
                                      PP_Instance instance,
                                      const PPB_X509Certificate_Fields& fields);
-  virtual ~PPB_X509Certificate_Private_Shared();
+  ~PPB_X509Certificate_Private_Shared() override;
 
   // Resource overrides.
-  virtual PPB_X509Certificate_Private_API*
-      AsPPB_X509Certificate_Private_API() override;
+  PPB_X509Certificate_Private_API* AsPPB_X509Certificate_Private_API() override;
 
   // PPB_X509Certificate_Private_API implementation.
-  virtual PP_Bool Initialize(const char* bytes, uint32_t length) override;
-  virtual PP_Var GetField(PP_X509Certificate_Private_Field field) override;
+  PP_Bool Initialize(const char* bytes, uint32_t length) override;
+  PP_Var GetField(PP_X509Certificate_Private_Field field) override;
 
  protected:
   virtual bool ParseDER(const std::vector<char>& der,
                         PPB_X509Certificate_Fields* result);
 
  private:
   scoped_ptr<PPB_X509Certificate_Fields> fields_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_X509Certificate_Private_Shared);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PRIVATE_X509_CERTIFICATE_PRIVATE_IMPL_H_