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

ppapi/proxy/pdf_resource.h

 // Copyright (c) 2013 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_PROXY_PDF_RESOURCE_H_
 #define PPAPI_PROXY_PDF_RESOURCE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/c/private/ppb_flash.h"
 #include "ppapi/proxy/connection.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
 #include "ppapi/thunk/ppb_pdf_api.h"
 
 namespace ppapi {
 namespace proxy {
 
 class PluginDispatcher;
 
 class PPAPI_PROXY_EXPORT PDFResource
     : public PluginResource,
       public thunk::PPB_PDF_API {
  public:
   PDFResource(Connection connection, PP_Instance instance);
-  virtual ~PDFResource();
+  ~PDFResource() override;
 
   // For unittesting with a given locale.
   void SetLocaleForTest(const std::string& locale) {
     locale_ = locale;
   }
 
   // Resource override.
-  virtual thunk::PPB_PDF_API* AsPPB_PDF_API() override;
+  thunk::PPB_PDF_API* AsPPB_PDF_API() override;
 
   // PPB_PDF_API implementation.
   PP_Var GetLocalizedString(PP_ResourceString string_id) override;
-  virtual void SearchString(const unsigned short* input_string,
-                            const unsigned short* input_term,
-                            bool case_sensitive,
-                            PP_PrivateFindResult** results,
-                            int* count) override;
-  virtual void DidStartLoading() override;
-  virtual void DidStopLoading() override;
-  virtual void SetContentRestriction(int restrictions) override;
-  virtual void HistogramPDFPageCount(int count) override;
-  virtual void UserMetricsRecordAction(const PP_Var& action) override;
-  virtual void HasUnsupportedFeature() override;
-  virtual void Print() override;
-  virtual void SaveAs() override;
-  virtual PP_Bool IsFeatureEnabled(PP_PDFFeature feature) override;
-  virtual PP_Resource GetResourceImageForScale(PP_ResourceImage image_id,
-                                               float scale) override;
-  virtual PP_Resource GetResourceImage(PP_ResourceImage image_id) override;
-  virtual PP_Bool IsOutOfProcess() override;
-  virtual void SetSelectedText(const char* selected_text) override;
-  virtual void SetLinkUnderCursor(const char* url) override;
-  virtual void GetV8ExternalSnapshotData(const char** natives_data_out,
-                                         int* natives_size_out,
-                                         const char** snapshot_data_out,
-                                         int* snapshot_size_out) override;
+  void SearchString(const unsigned short* input_string,
+                    const unsigned short* input_term,
+                    bool case_sensitive,
+                    PP_PrivateFindResult** results,
+                    int* count) override;
+  void DidStartLoading() override;
+  void DidStopLoading() override;
+  void SetContentRestriction(int restrictions) override;
+  void HistogramPDFPageCount(int count) override;
+  void UserMetricsRecordAction(const PP_Var& action) override;
+  void HasUnsupportedFeature() override;
+  void Print() override;
+  void SaveAs() override;
+  PP_Bool IsFeatureEnabled(PP_PDFFeature feature) override;
+  PP_Resource GetResourceImageForScale(PP_ResourceImage image_id,
+                                       float scale) override;
+  PP_Resource GetResourceImage(PP_ResourceImage image_id) override;
+  PP_Bool IsOutOfProcess() override;
+  void SetSelectedText(const char* selected_text) override;
+  void SetLinkUnderCursor(const char* url) override;
+  void GetV8ExternalSnapshotData(const char** natives_data_out,
+                                 int* natives_size_out,
+                                 const char** snapshot_data_out,
+                                 int* snapshot_size_out) override;
 
  private:
   std::string locale_;
 
   DISALLOW_COPY_AND_ASSIGN(PDFResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PDF_RESOURCE_H_