Ozone: Fix Linux Build.

https://codereview.chromium.org/831863003 has enabled strict checks
for {virtual,override,final} on Linux. This CL fixes build issues
for Ozone on Linux.

BUG=417463

Review URL: https://codereview.chromium.org/825783003

Cr-Commit-Position: refs/heads/master@{#310136}

ash/host/ash_window_tree_host_ozone.cc

@@ -21,23 +21,23 @@ class AshWindowTreeHostOzone : public AshWindowTreeHost,
                                public aura::WindowTreeHostOzone {
  public:
   explicit AshWindowTreeHostOzone(const gfx::Rect& initial_bounds);
-  virtual ~AshWindowTreeHostOzone();
+  ~AshWindowTreeHostOzone() override;
 
  private:
   // AshWindowTreeHost:
-  virtual void ToggleFullScreen() override;
-  virtual bool ConfineCursorToRootWindow() override;
-  virtual void UnConfineCursor() override;
-  virtual void SetRootWindowTransformer(
+  void ToggleFullScreen() override;
+  bool ConfineCursorToRootWindow() override;
+  void UnConfineCursor() override;
+  void SetRootWindowTransformer(
       scoped_ptr<RootWindowTransformer> transformer) override;
-  virtual gfx::Insets GetHostInsets() const override;
-  virtual aura::WindowTreeHost* AsWindowTreeHost() override;
-  virtual void SetRootTransform(const gfx::Transform& transform) override;
-  virtual gfx::Transform GetRootTransform() const override;
-  virtual gfx::Transform GetInverseRootTransform() const override;
-  virtual void UpdateRootWindowSize(const gfx::Size& host_size) override;
-  virtual void OnCursorVisibilityChangedNative(bool show) override;
-  virtual void DispatchEvent(ui::Event* event) override;
+  gfx::Insets GetHostInsets() const override;
+  aura::WindowTreeHost* AsWindowTreeHost() override;
+  void SetRootTransform(const gfx::Transform& transform) override;
+  gfx::Transform GetRootTransform() const override;
+  gfx::Transform GetInverseRootTransform() const override;
+  void UpdateRootWindowSize(const gfx::Size& host_size) override;
+  void OnCursorVisibilityChangedNative(bool show) override;
+  void DispatchEvent(ui::Event* event) override;
 
   // Temporarily disable the tap-to-click feature. Used on CrOS.
   void SetTapToClickPaused(bool state);

chrome/browser/extensions/global_shortcut_listener_ozone.h

@@ -15,16 +15,14 @@ namespace extensions {
 class GlobalShortcutListenerOzone : public GlobalShortcutListener {
  public:
   GlobalShortcutListenerOzone();
-  virtual ~GlobalShortcutListenerOzone();
+  ~GlobalShortcutListenerOzone() override;
 
  private:
   // GlobalShortcutListener implementation.
-  virtual void StartListening() override;
-  virtual void StopListening() override;
-  virtual bool RegisterAcceleratorImpl(
-      const ui::Accelerator& accelerator) override;
-  virtual void UnregisterAcceleratorImpl(
-      const ui::Accelerator& accelerator) override;
+  void StartListening() override;
+  void StopListening() override;
+  bool RegisterAcceleratorImpl(const ui::Accelerator& accelerator) override;
+  void UnregisterAcceleratorImpl(const ui::Accelerator& accelerator) override;
 
   // Whether this object is listening for global shortcuts.
   bool is_listening_;

chrome/browser/ui/views/chrome_javascript_native_dialog_factory_views.cc

@@ -26,7 +26,7 @@ class ChromeJavaScriptAppModalDialogViews
       app_modal::JavaScriptAppModalDialog* parent)
       : app_modal::JavaScriptAppModalDialogViews(parent),
         helper_(new AppModalDialogHelper(parent->web_contents())) {}
-  virtual ~ChromeJavaScriptAppModalDialogViews() {}
+  ~ChromeJavaScriptAppModalDialogViews() override {}
 
  private:
   scoped_ptr<AppModalDialogHelper> helper_;