Makes Screen functions take a const gfx::NativeView

extensions/shell/browser/shell_screen.cc

 // Copyright 2014 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 "extensions/shell/browser/shell_screen.h"
 
 #include <stdint.h>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 62 matching lines @@
 
 int ShellScreen::GetNumDisplays() const {
   return 1;
 }
 
 std::vector<display::Display> ShellScreen::GetAllDisplays() const {
   return std::vector<display::Display>(1, display_);
 }
 
 display::Display ShellScreen::GetDisplayNearestWindow(
-    gfx::NativeWindow window) const {
+    const gfx::NativeWindow window) const {
   return display_;
 }
 
 display::Display ShellScreen::GetDisplayNearestPoint(
     const gfx::Point& point) const {
   return display_;
 }
 
 display::Display ShellScreen::GetDisplayMatching(
     const gfx::Rect& match_rect) const {
   return display_;
 }
 
 display::Display ShellScreen::GetPrimaryDisplay() const {
   return display_;
 }
 
 void ShellScreen::AddObserver(display::DisplayObserver* observer) {}
 
 void ShellScreen::RemoveObserver(display::DisplayObserver* observer) {}
 
 }  // namespace extensions