Switch AccessibilityMode to be a bitmap

content/renderer/accessibility/renderer_accessibility_complete.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_RENDERER_ACCESSIBILITY_RENDERER_ACCESSIBILITY_COMPLETE_H_
 #define CONTENT_RENDERER_ACCESSIBILITY_RENDERER_ACCESSIBILITY_COMPLETE_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 113 matching lines @@
   BrowserTreeNode* browser_root_;
 
   // A map from IDs to nodes in the browser tree.
   base::hash_map<int32, BrowserTreeNode*> browser_id_map_;
 
   // The most recently observed scroll offset of the root document element.
   // TODO(dmazzoni): remove once https://bugs.webkit.org/show_bug.cgi?id=73460
   // is fixed.
   gfx::Size last_scroll_offset_;
 
-  // The current accessibility mode.
-  AccessibilityMode mode_;
-
   // Set if we are waiting for an accessibility event ack.
   bool ack_pending_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererAccessibilityComplete);
 };
 
 #endif  // CONTENT_RENDERER_ACCESSIBILITY_RENDERER_ACCESSIBILITY_COMPLETE_H_
 
 }  // namespace content