Enforce marking "override" for functions overriding Blink in components/.

components/nacl/renderer/manifest_downloader.h

 // Copyright 2014 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.
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "components/nacl/renderer/ppb_nacl_private.h"
 #include "third_party/WebKit/public/platform/WebURLLoaderClient.h"
@@ skipping 14 matching lines @@
 
   // This is a pretty arbitrary limit on the byte size of the NaCl manifest
   // file.
   // Note that the resulting string object has to have at least one byte extra
   // for the null termination character.
   static const size_t kNaClManifestMaxFileBytes = 1024 * 1024;
 
   ManifestDownloader(scoped_ptr<blink::WebURLLoader> url_loader,
                      bool is_installed,
                      Callback cb);
-  virtual ~ManifestDownloader();
+  ~ManifestDownloader() override;
 
   void Load(const blink::WebURLRequest& request);
 
  private:
   void Close();
 
   // WebURLLoaderClient implementation.
-  virtual void didReceiveResponse(blink::WebURLLoader* loader,
-                                  const blink::WebURLResponse& response);
-  virtual void didReceiveData(blink::WebURLLoader* loader,
-                              const char* data,
-                              int data_length,
-                              int encoded_data_length);
-  virtual void didFinishLoading(blink::WebURLLoader* loader,
-                                double finish_time,
-                                int64_t total_encoded_data_length);
-  virtual void didFail(blink::WebURLLoader* loader,
-                       const blink::WebURLError& error);
+  void didReceiveResponse(blink::WebURLLoader* loader,
+                          const blink::WebURLResponse& response) override;
+  void didReceiveData(blink::WebURLLoader* loader,
+                      const char* data,
+                      int data_length,
+                      int encoded_data_length) override;
+  void didFinishLoading(blink::WebURLLoader* loader,
+                        double finish_time,
+                        int64_t total_encoded_data_length) override;
+  void didFail(blink::WebURLLoader* loader,
+               const blink::WebURLError& error) override;
 
   scoped_ptr<blink::WebURLLoader> url_loader_;
   bool is_installed_;
   Callback cb_;
   std::string buffer_;
   int status_code_;
   PP_NaClError pp_nacl_error_;
 };
 
 }  // namespace nacl