Hide AXPlatformNode on ChromeOS.

ui/views/accessibility/native_view_accessibility.cc

Index: ui/views/accessibility/native_view_accessibility.cc
diff --git a/ui/views/accessibility/native_view_accessibility.cc b/ui/views/accessibility/native_view_accessibility.cc
index 891d2cc3f50ec9d488fa4ba76ce4f66b52583846..4cb379638ce9f78c121fe412afebe13bd47d125c 100644
--- a/ui/views/accessibility/native_view_accessibility.cc
+++ b/ui/views/accessibility/native_view_accessibility.cc
@@ -14,37 +14,25 @@
 
 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) {