Standardize usage of virtual/override/final specifiers.

The Google C++ style guide states:

  Explicitly annotate overrides of virtual functions or virtual
  destructors with an override or (less frequently) final specifier.
  Older (pre-C++11) code will use the virtual keyword as an inferior
  alternative annotation. For clarity, use exactly one of override,
  final, or virtual when declaring an override.

To better conform to these guidelines, the following constructs have
been rewritten:

- if a base class has a virtual destructor, then:
    virtual ~Foo();                   ->  ~Foo() override;
- virtual void Foo() override;        ->  void Foo() override;
- virtual void Foo() override final;  ->  void Foo() final;

This patch was automatically generated. The clang plugin can generate
fixit hints, which are suggested edits when it is 100% sure it knows how
to fix a problem. The hints from the clang plugin were applied to the
source tree using the tool in https://codereview.chromium.org/598073004.

BUG=417463
R=caitkp@chromium.org

Review URL: https://codereview.chromium.org/684513002

Cr-Commit-Position: refs/heads/master@{#301931}

1 files changed, 4 insertions, 4 deletions

diff --git a/components/sessions/content/content_serialized_navigation_driver.h b/components/sessions/content/content_serialized_navigation_driver.h
index 499d258..c7829f2 100644
--- a/components/sessions/content/content_serialized_navigation_driver.h
+++ b/components/sessions/content/content_serialized_navigation_driver.h
@@ -18,17 +18,17 @@ namespace sessions {
 class SESSIONS_EXPORT_PRIVATE ContentSerializedNavigationDriver
     : public SerializedNavigationDriver {
  public:
-  virtual ~ContentSerializedNavigationDriver();
+  ~ContentSerializedNavigationDriver() override;
 
   // Returns the singleton ContentSerializedNavigationDriver.  Almost all
   // callers should use SerializedNavigationDriver::Get() instead.
   static ContentSerializedNavigationDriver* GetInstance();
 
   // SerializedNavigationDriver implementation.
-  virtual int GetDefaultReferrerPolicy() const override;
-  virtual std::string GetSanitizedPageStateForPickle(
+  int GetDefaultReferrerPolicy() const override;
+  std::string GetSanitizedPageStateForPickle(
       const SerializedNavigationEntry* navigation) const override;
-  virtual void Sanitize(SerializedNavigationEntry* navigation) const override;
+  void Sanitize(SerializedNavigationEntry* navigation) const override;
 
  private:
   ContentSerializedNavigationDriver();