Standardize usage of virtual/override/final in net/

net/base/upload_file_element_reader.h

Index: net/base/upload_file_element_reader.h
diff --git a/net/base/upload_file_element_reader.h b/net/base/upload_file_element_reader.h
index dc27585fd2e05bd8117f8f2d3fa49175552d415f..fc3f3349a8bbac7c7efacf2173b65c6df1efa000 100644
--- a/net/base/upload_file_element_reader.h
+++ b/net/base/upload_file_element_reader.h
@@ -32,7 +32,7 @@ class NET_EXPORT UploadFileElementReader : public UploadElementReader {
                           uint64 range_offset,
                           uint64 range_length,
                           const base::Time& expected_modification_time);
-  virtual ~UploadFileElementReader();
+  ~UploadFileElementReader() override;
 
   const base::FilePath& path() const { return path_; }
   uint64 range_offset() const { return range_offset_; }
@@ -42,13 +42,13 @@ class NET_EXPORT UploadFileElementReader : public UploadElementReader {
   }
 
   // UploadElementReader overrides:
-  virtual const UploadFileElementReader* AsFileReader() const override;
-  virtual int Init(const CompletionCallback& callback) override;
-  virtual uint64 GetContentLength() const override;
-  virtual uint64 BytesRemaining() const override;
-  virtual int Read(IOBuffer* buf,
-                   int buf_length,
-                   const CompletionCallback& callback) override;
+  const UploadFileElementReader* AsFileReader() const override;
+  int Init(const CompletionCallback& callback) override;
+  uint64 GetContentLength() const override;
+  uint64 BytesRemaining() const override;
+  int Read(IOBuffer* buf,
+           int buf_length,
+           const CompletionCallback& callback) override;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ElementsUploadDataStreamTest, FileSmallerThanLength);