Revert of Cross-process iframe accessibility.

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..eeb940e793bdd8021a305dcfc5d4cda15d65ac83 100644
--- a/content/browser/accessibility/browser_accessibility.h
+++ b/content/browser/accessibility/browser_accessibility.h
@@ -31,13 +31,12 @@
 //
 // BrowserAccessibility
 //
-// A BrowserAccessibility object represents one node in the accessibility
-// tree on the browser side. It exactly corresponds to one WebAXObject from
-// Blink. It's owned by a BrowserAccessibilityManager.
-//
-// There are subclasses of BrowserAccessibility for each platform where
-// we implement native accessibility APIs. This base class is used occasionally
-// for tests.
+// Class implementing the cross platform interface for the Browser-Renderer
+// communication of accessibility information, providing accessibility
+// to be used by screen readers and other assistive technology (AT).
+//
+// An implementation for each platform handles platform specific accessibility
+// APIs.
 //
 ////////////////////////////////////////////////////////////////////////////////
 class CONTENT_EXPORT BrowserAccessibility {
@@ -246,15 +245,6 @@
   // 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 +262,7 @@
   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_;
-
+ private:
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibility);
 };