Standardize usage of virtual/override/final in content/browser/

content/browser/file_descriptor_info_impl.h

Index: content/browser/file_descriptor_info_impl.h
diff --git a/content/browser/file_descriptor_info_impl.h b/content/browser/file_descriptor_info_impl.h
index cf6a4f256468d7e68ed936642903eee3e9ef92d7..78d746e22d4942ff6e15a858f3b794e8250b2764 100644
--- a/content/browser/file_descriptor_info_impl.h
+++ b/content/browser/file_descriptor_info_impl.h
@@ -16,15 +16,15 @@ class FileDescriptorInfoImpl : public FileDescriptorInfo {
  public:
   CONTENT_EXPORT static scoped_ptr<FileDescriptorInfo> Create();
 
-  virtual ~FileDescriptorInfoImpl();
-  virtual void Share(int id, base::PlatformFile fd) override;
-  virtual void Transfer(int id, base::ScopedFD fd) override;
-  virtual const base::FileHandleMappingVector& GetMapping() const override;
-  virtual base::FileHandleMappingVector GetMappingWithIDAdjustment(
+  ~FileDescriptorInfoImpl() override;
+  void Share(int id, base::PlatformFile fd) override;
+  void Transfer(int id, base::ScopedFD fd) override;
+  const base::FileHandleMappingVector& GetMapping() const override;
+  base::FileHandleMappingVector GetMappingWithIDAdjustment(
       int delta) const override;
-  virtual base::PlatformFile GetFDAt(size_t i) const override;
-  virtual int GetIDAt(size_t i) const override;
-  virtual size_t GetMappingSize() const override;
+  base::PlatformFile GetFDAt(size_t i) const override;
+  int GetIDAt(size_t i) const override;
+  size_t GetMappingSize() const override;
 
  private:
   FileDescriptorInfoImpl();