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=flackr@chromium.org

Review URL: https://codereview.chromium.org/645513008

Cr-Commit-Position: refs/heads/master@{#301541}

1 files changed, 4 insertions, 4 deletions

diff --git a/ash/wm/mru_window_tracker.h b/ash/wm/mru_window_tracker.h
index ff70166..6f6dd5f 100644
--- a/ash/wm/mru_window_tracker.h
+++ b/ash/wm/mru_window_tracker.h
@@ -34,7 +34,7 @@ class ASH_EXPORT MruWindowTracker
 
   explicit MruWindowTracker(
       aura::client::ActivationClient* activation_client);
-  virtual ~MruWindowTracker();
+  ~MruWindowTracker() override;
 
   // Returns the set of windows which can be cycled through. This method creates
   // the vector based on the current set of windows across all valid root
@@ -61,11 +61,11 @@ class ASH_EXPORT MruWindowTracker
   void SetActiveWindow(aura::Window* active_window);
 
   // Overridden from aura::client::ActivationChangeObserver:
-  virtual void OnWindowActivated(aura::Window* gained_active,
-                                 aura::Window* lost_active) override;
+  void OnWindowActivated(aura::Window* gained_active,
+                         aura::Window* lost_active) override;
 
   // Overridden from WindowObserver:
-  virtual void OnWindowDestroyed(aura::Window* window) override;
+  void OnWindowDestroyed(aura::Window* window) override;
 
   // List of windows that have been activated in containers that we cycle
   // through, sorted by most recently used.