ash: Remove OS_CHROMEOS ifdefs from accelerator files

ash/accelerators/magnifier_key_scroller.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 "ash/accelerators/magnifier_key_scroller.h"
 
 #include <utility>
 
 #include "ash/accelerators/key_hold_detector.h"
 #include "ash/common/ash_switches.h"
 #include "ash/magnifier/magnification_controller.h"
 #include "ash/shell.h"
 #include "base/command_line.h"
 #include "ui/events/event.h"
 
 namespace ash {
 namespace {
 bool magnifier_key_scroller_enabled = false;
 }
 
 // static
 bool MagnifierKeyScroller::IsEnabled() {
-  bool has_switch = false;
-#if defined(OS_CHROMEOS)
-  has_switch = base::CommandLine::ForCurrentProcess()->HasSwitch(
+  bool has_switch = base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kAshEnableMagnifierKeyScroller);
-#endif
 
   return (magnifier_key_scroller_enabled || has_switch) &&
          ash::Shell::GetInstance()->magnification_controller()->IsEnabled();
 }
 
 // static
 void MagnifierKeyScroller::SetEnabled(bool enabled) {
   magnifier_key_scroller_enabled = enabled;
 }
 
@@ skipping 46 matching lines @@
   MagnificationController* controller =
       Shell::GetInstance()->magnification_controller();
   controller->SetScrollDirection(MagnificationController::SCROLL_NONE);
 }
 
 MagnifierKeyScroller::MagnifierKeyScroller() {}
 
 MagnifierKeyScroller::~MagnifierKeyScroller() {}
 
 }  // namespace ash