Fix the typo "visibility".

mandoline/ui/aura/native_widget_view_manager.cc

 // Copyright 2015 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 "mandoline/ui/aura/native_widget_view_manager.h"
 
 #include "mandoline/ui/aura/input_method_mandoline.h"
 #include "mandoline/ui/aura/window_tree_host_mojo.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "mojo/converters/input_events/input_events_type_converters.h"
@@ skipping 54 matching lines @@
     const views::Widget::InitParams& in_params) {
   views::Widget::InitParams params(in_params);
   params.parent = window_tree_host_->window();
   NativeWidgetAura::InitNativeWidget(params);
 }
 
 void NativeWidgetViewManager::OnWindowVisibilityChanged(aura::Window* window,
                                                         bool visible) {
   view_->SetVisible(visible);
   // NOTE: We could also update aura::Window's visibility when the View's
-  // visibilty changes, but this code isn't going to be around for very long so
+  // visibility changes, but this code isn't going to be around for very long so
   // I'm not bothering.
 }
 
 void NativeWidgetViewManager::OnViewDestroyed(mus::View* view) {
   DCHECK_EQ(view, view_);
   view->RemoveObserver(this);
   view_ = NULL;
   // TODO(sky): WindowTreeHostMojo assumes the View outlives it.
   // NativeWidgetViewManager needs to deal, likely by deleting this.
 }
@@ skipping 22 matching lines @@
 
   if (ui_event->IsKeyEvent()) {
     window_tree_host_->GetInputMethod()->DispatchKeyEvent(
         static_cast<ui::KeyEvent*>(ui_event.get()));
   } else {
     window_tree_host_->SendEventToProcessor(ui_event.get());
   }
 }
 
 }  // namespace mandoline