Makes Screen functions take a const gfx::NativeView

ui/display/ios/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/display/screen.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/logging.h"
 #include "ui/display/display.h"
@@ skipping 25 matching lines @@
     return [[UIScreen screens] count];
 #endif
   }
 
   std::vector<Display> GetAllDisplays() const override {
     NOTIMPLEMENTED();
     return std::vector<Display>(1, GetPrimaryDisplay());
   }
 
   // Returns the display nearest the specified window.
-  Display GetDisplayNearestWindow(gfx::NativeView view) const override {
+  Display GetDisplayNearestWindow(const gfx::NativeView view) const override {
     NOTIMPLEMENTED();
     return Display();
   }
 
   // Returns the the display nearest the specified point.
   Display GetDisplayNearestPoint(const gfx::Point& point) const override {
     NOTIMPLEMENTED();
     return Display();
   }
 
@@ skipping 21 matching lines @@
   }
 };
 
 }  // namespace
 
 Screen* CreateNativeScreen() {
   return new ScreenIos;
 }
 
 }  // namespace gfx