Fix mouse lock on chromeos

ash/magnifier/magnification_controller.cc

 // 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 "ash/magnifier/magnification_controller.h"
 
 #include "ash/shell.h"
 #include "ui/aura/event_filter.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/shared/compound_event_filter.h"
@@ skipping 277 matching lines @@
   if (start_zoom && !is_on_zooming_) {
     bool ret = RedrawDIP(gfx::Point(x, y), scale_, true);
 
     if (ret) {
       is_on_zooming_ = true;
 
       int x_diff = origin_.x() - window_rect.x();
       int y_diff = origin_.y() - window_rect.y();
       // If the magnified region is moved, hides the mouse cursor and moves it.
       if (x_diff != 0 || y_diff != 0) {
-        ash::Shell::GetInstance()->
-            env_filter()->set_update_cursor_visibility(false);
         root_window_->ShowCursor(false);
         mouse.set_x(mouse.x() - (origin_.x() - window_rect.x()));
         mouse.set_y(mouse.y() - (origin_.y() - window_rect.y()));
         root_window_->MoveCursorTo(mouse);
       }
     }
   }
 }
 
 gfx::Size MagnificationControllerImpl::GetHostSizeDIP() const {
@@ skipping 151 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // MagnificationController:
 
 // static
 MagnificationController* MagnificationController::CreateInstance() {
   return new MagnificationControllerImpl();
 }
 
 }  // namespace internal
 }  // namespace ash