components: Cleanup class/struct fwd declarations

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 RenderFrame;
 class RendererPpapiHost;
 }
 
 namespace gfx {
 class Transform;
 };
 
 namespace pdf {
 
 class PdfAccessibilityTree
@@ skipping 57 matching lines @@
   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_