Hide AXPlatformNode on ChromeOS.

ui/views/accessibility/native_view_accessibility.cc

 // Copyright (c) 2013 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/views/accessibility/native_view_accessibility.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/events/event_utils.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/controls/native/native_view_host.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace views {
 
-#if !defined(PLATFORM_HAS_NATIVE_VIEW_ACCESSIBILITY_IMPL)
-// static
-std::unique_ptr<NativeViewAccessibility> NativeViewAccessibility::Create(
-    View* view) {
-  // Use WrapUnique over MakeUnique to invoke the protected constructor.
-  return base::WrapUnique<NativeViewAccessibility>(
-      new NativeViewAccessibility(view));
-}
-#endif  // !defined(PLATFORM_HAS_NATIVE_VIEW_ACCESSIBILITY_IMPL)
-
 NativeViewAccessibility::NativeViewAccessibility(View* view)
     : view_(view),
       parent_widget_(nullptr),
-      ax_node_(nullptr) {
-  ax_node_ = ui::AXPlatformNode::Create(this);
+      ax_node_(ui::AXPlatformNode::Create(this)) {
+  DCHECK(ax_node_);
 }
 
 NativeViewAccessibility::~NativeViewAccessibility() {
-  if (ax_node_)
-    ax_node_->Destroy();
+  ax_node_->Destroy();
   if (parent_widget_)
     parent_widget_->RemoveObserver(this);
 }
 
 gfx::NativeViewAccessible NativeViewAccessibility::GetNativeObject() {
-  return ax_node_ ? ax_node_->GetNativeViewAccessible() : nullptr;
+  return ax_node_->GetNativeViewAccessible();
 }
 
 void NativeViewAccessibility::NotifyAccessibilityEvent(ui::AXEvent event_type) {
-  if (ax_node_)
-    ax_node_->NotifyAccessibilityEvent(event_type);
+  ax_node_->NotifyAccessibilityEvent(event_type);
 }
 
 bool NativeViewAccessibility::SetFocused(bool focused) {
   if (!ui::AXNodeData::IsFlagSet(GetData().state, ui::AX_STATE_FOCUSABLE))
     return false;
 
   if (focused)
     view_->RequestFocus();
   else if (view_->HasFocus())
     view_->GetFocusManager()->ClearFocus();
@@ skipping 214 matching lines @@
               child_widget_platform_node->GetDelegate());
       if (child_widget_view_accessibility->parent_widget() != widget)
         child_widget_view_accessibility->SetParentWidget(widget);
     }
 
     result_child_widgets->push_back(child_widget);
   }
 }
 
 }  // namespace views