Less strict checked state changes and introduce disabled state for content

components/pdf/renderer/pdf_accessibility_tree.cc

 // Copyright 2016 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 <algorithm>
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversion_utils.h"
 #include "components/pdf/renderer/pdf_accessibility_tree.h"
@@ skipping 240 matching lines @@
   return gfx::RectF(r.point.x, r.point.y, r.size.width, r.size.height);
 }
 
 ui::AXNodeData* PdfAccessibilityTree::CreateNode(ui::AXRole role) {
   content::RenderAccessibility* render_accessibility = GetRenderAccessibility();
   DCHECK(render_accessibility);
 
   ui::AXNodeData* node = new ui::AXNodeData();
   node->id = render_accessibility->GenerateAXID();
   node->role = role;
-  node->state = 1 << ui::AX_STATE_ENABLED | 1 << ui::AX_STATE_READ_ONLY;
+  node->state = 1 << ui::AX_STATE_READ_ONLY;
   nodes_.push_back(base::WrapUnique(node));
   return node;
 }
 
 float PdfAccessibilityTree::GetDeviceScaleFactor() const {
   content::RenderFrame* render_frame =
       host_->GetRenderFrameForInstance(instance_);
   DCHECK(render_frame);
   return render_frame->GetRenderView()->GetDeviceScaleFactor();
 }
@@ skipping 47 matching lines @@
 const ui::AXNode* PdfAccessibilityTree::GetNull() const {
   return nullptr;
 }
 
 void PdfAccessibilityTree::SerializeNode(
     const ui::AXNode* node, ui::AXNodeData* out_data) const {
   *out_data = node->data();
 }
 
 }  // namespace pdf