Hook up guest browser plugins to the accessibility tree.

content/browser/accessibility/browser_accessibility.h

Index: content/browser/accessibility/browser_accessibility.h
diff --git a/content/browser/accessibility/browser_accessibility.h b/content/browser/accessibility/browser_accessibility.h
index 912620ebb49e14e02ca79eb57fdbb7f0567cb884..8c1822b6aeac75b6cbd3a844724b7ca543d4bc9f 100644
--- a/content/browser/accessibility/browser_accessibility.h
+++ b/content/browser/accessibility/browser_accessibility.h
@@ -246,15 +246,6 @@ class CONTENT_EXPORT BrowserAccessibility {
   // Append the text from this node and its children.
   std::string GetTextRecursive() const;
 
-  // Identifies the given frame tree node id as the only child of this node,
-  // so any call to PlatformChildCount/PlatformGetChild will use
-  // BrowserAccessibilityDelegate::AccessibilityGetChildFrame to retrieve
-  // the BrowserAccessibilityManager of the child frame and return its root
-  // node as this node's child.
-  void SetChildFrameTreeNodeId(int64 child_frame_tree_node_id);
-
-  int64 child_frame_tree_node_id() const { return child_frame_tree_node_id_; }
-
  protected:
   BrowserAccessibility();
 
@@ -272,9 +263,6 @@ class CONTENT_EXPORT BrowserAccessibility {
   std::string name_;
   std::string value_;
 
-  // If nonzero, the frame tree node id of the child frame of this node.
-  int64 child_frame_tree_node_id_;
-
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibility);
 };