Enable strict-virtual-specifiers for iOS builds.

ui/gfx/screen_ios.mm

Index: ui/gfx/screen_ios.mm
diff --git a/ui/gfx/screen_ios.mm b/ui/gfx/screen_ios.mm
index e05568e488dd88f27c27c8d2eda8024130889e56..6ace9c8ed2975a68a9be4b7216539cf2ebd03581 100644
--- a/ui/gfx/screen_ios.mm
+++ b/ui/gfx/screen_ios.mm
@@ -12,23 +12,22 @@
 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;
@@ -37,34 +36,31 @@ class ScreenIos : public gfx::Screen {
 #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));
@@ -72,11 +68,11 @@ class ScreenIos : public gfx::Screen {
     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.
   }
 };