Remove unused ui::AXPlatformNode pointer from BrowserAccessibility.

content/browser/accessibility/browser_accessibility.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 390 matching lines @@
 
   // The manager of this tree of accessibility objects.
   BrowserAccessibilityManager* manager_;
 
   // The underlying node.
   ui::AXNode* node_;
 
   // A unique ID, since node IDs are frame-local.
   int32_t unique_id_;
 
-  // The platform-specific object that implements the accessibility APIs for
-  // this node. Currently some of the platform-specific code is implemented by
-  // subclasses of BrowserAccessibility and some by |platform_node_|, but
-  // eventually we want all of that code to be in AXPlatformNode.  See
-  // http://crbug.com/703369
-  ui::AXPlatformNode* platform_node_;
-
  private:
   // |GetInnerText| recursively includes all the text from descendants such as
   // text found in any embedded object. In contrast, |GetText| might include a
   // special character in the place of every embedded object instead of its
   // text, depending on the platform.
   base::string16 GetInnerText() const;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibility);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_