Switch in box ChromeVox to use new background page.

ui/views/accessibility/ax_view_obj_wrapper.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 "ui/views/accessibility/ax_view_obj_wrapper.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/views/accessibility/ax_aura_obj_cache.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace views {
 
 AXViewObjWrapper::AXViewObjWrapper(View* view)  : view_(view) {
-  DCHECK(view->GetWidget());
   if (view->GetWidget())
     AXAuraObjCache::GetInstance()->GetOrCreate(view->GetWidget());
 }
 
 AXViewObjWrapper::~AXViewObjWrapper() {}
 
 AXAuraObjWrapper* AXViewObjWrapper::GetParent() {
   AXAuraObjCache* cache = AXAuraObjCache::GetInstance();
   if (view_->parent())
     return cache->GetOrCreate(view_->parent());
 
-  return cache->GetOrCreate(view_->GetWidget());
+  if (view_->GetWidget())
+    return cache->GetOrCreate(view_->GetWidget());
+
+  return NULL;
 }
 
 void AXViewObjWrapper::GetChildren(
     std::vector<AXAuraObjWrapper*>* out_children) {
   // TODO(dtseng): Need to handle |Widget| child of |View|.
   for (int i = 0; i < view_->child_count(); ++i) {
     AXAuraObjWrapper* child =
         AXAuraObjCache::GetInstance()->GetOrCreate(view_->child_at(i));
     out_children->push_back(child);
   }
@@ skipping 46 matching lines @@
 
 void AXViewObjWrapper::MakeVisible() {
   // TODO(dtseng): Implement.
 }
 
 void AXViewObjWrapper::SetSelection(int32 start, int32 end) {
   // TODO(dtseng): Implement.
 }
 
 }  // namespace views