Enable PDF accessibility when RenderFrame's accessibility mode changes.

components/pdf/renderer/pdf_accessibility_tree.h

 // 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.
 
 #ifndef COMPONENTS_PDF_RENDERER_PDF_ACCESSIBILITY_TREE_H_
 #define COMPONENTS_PDF_RENDERER_PDF_ACCESSIBILITY_TREE_H_
 
 #include <memory>
 #include <vector>
 
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/private/ppb_pdf.h"
 #include "ui/accessibility/ax_node.h"
 #include "ui/accessibility/ax_tree.h"
 #include "ui/accessibility/ax_tree_source.h"
 #include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/geometry/vector2d_f.h"
 
 namespace content {
-class RenderAccessibility;
 class RenderView;
 }
 
 namespace pdf {
 
 class PdfAccessibilityTree
     : public ui::AXTreeSource<const ui::AXNode*,
                               ui::AXNodeData,
                               ui::AXTreeData> {
  public:
@@ skipping 38 matching lines @@
       const PP_PrivateAccessibilityTextRunInfo& text_run,
       const std::vector<PP_PrivateAccessibilityCharInfo>& chars,
       int char_index);
   gfx::Vector2dF ToVector2dF(const PP_Point& p);
   gfx::RectF ToRectF(const PP_Rect& r);
   ui::AXNodeData* CreateNode(ui::AXRole role);
   float GetDeviceScaleFactor() const;
 
   ui::AXTree tree_;
   content::RenderView* render_view_;
-  content::RenderAccessibility* render_accessibility_;
   double zoom_;
   gfx::Vector2dF scroll_;
   gfx::Vector2dF offset_;
   PP_PrivateAccessibilityDocInfo doc_info_;
   ui::AXNodeData* doc_node_;
   std::vector<std::unique_ptr<ui::AXNodeData>> nodes_;
 };
 
 }  // namespace pdf;
 
 #endif  // COMPONENTS_PDF_RENDERER_PDF_ACCESSIBILITY_TREE_H_