Enable strict-virtual-specifiers for iOS builds.

ui/gfx/screen_ios.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/screen.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/logging.h"
 #include "ui/gfx/display.h"
 
 namespace {
 
 class ScreenIos : public gfx::Screen {
-  virtual gfx::Point GetCursorScreenPoint() override {
+  gfx::Point GetCursorScreenPoint() override {
     NOTIMPLEMENTED();
     return gfx::Point(0, 0);
   }
 
-  virtual gfx::NativeWindow GetWindowUnderCursor() override {
+  gfx::NativeWindow GetWindowUnderCursor() override {
     NOTIMPLEMENTED();
     return gfx::NativeWindow();
   }
 
-  virtual gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point)
-      override {
+  gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override {
     NOTIMPLEMENTED();
     return gfx::NativeWindow();
   }
 
-  virtual int GetNumDisplays() const override {
+  int GetNumDisplays() const override {
 #if TARGET_IPHONE_SIMULATOR
     // UIScreen does not reliably return correct results on the simulator.
     return 1;
 #else
     return [[UIScreen screens] count];
 #endif
   }
 
-  virtual std::vector<gfx::Display> GetAllDisplays() const override {
+  std::vector<gfx::Display> GetAllDisplays() const override {
     NOTIMPLEMENTED();
     return std::vector<gfx::Display>(1, GetPrimaryDisplay());
   }
 
   // Returns the display nearest the specified window.
-  virtual gfx::Display GetDisplayNearestWindow(
-      gfx::NativeView view) const override {
+  gfx::Display GetDisplayNearestWindow(gfx::NativeView view) const override {
     NOTIMPLEMENTED();
     return gfx::Display();
   }
 
   // Returns the the display nearest the specified point.
-  virtual gfx::Display GetDisplayNearestPoint(
-      const gfx::Point& point) const override {
+  gfx::Display GetDisplayNearestPoint(const gfx::Point& point) const override {
     NOTIMPLEMENTED();
     return gfx::Display();
   }
 
   // Returns the display that most closely intersects the provided bounds.
-  virtual gfx::Display GetDisplayMatching(
-      const gfx::Rect& match_rect) const override {
+  gfx::Display GetDisplayMatching(const gfx::Rect& match_rect) const override {
     NOTIMPLEMENTED();
     return gfx::Display();
   }
 
   // Returns the primary display.
-  virtual gfx::Display GetPrimaryDisplay() const override {
+  gfx::Display GetPrimaryDisplay() const override {
     UIScreen* mainScreen = [UIScreen mainScreen];
     CHECK(mainScreen);
     gfx::Display display(0, gfx::Rect(mainScreen.bounds));
     display.set_device_scale_factor([mainScreen scale]);
     return display;
   }
 
-  virtual void AddObserver(gfx::DisplayObserver* observer) override {
+  void AddObserver(gfx::DisplayObserver* observer) override {
     // no display change on iOS.
   }
 
-  virtual void RemoveObserver(gfx::DisplayObserver* observer) override {
+  void RemoveObserver(gfx::DisplayObserver* observer) override {
     // no display change on iOS.
   }
 };
 
 }  // namespace
 
 namespace gfx {
 
 Screen* CreateNativeScreen() {
   return new ScreenIos;
 }
 
 }  // namespace gfx