Revert of Migrate accessibility from RenderView to RenderFrame.

content/browser/renderer_host/render_widget_host_delegate.h

Index: content/browser/renderer_host/render_widget_host_delegate.h
diff --git a/content/browser/renderer_host/render_widget_host_delegate.h b/content/browser/renderer_host/render_widget_host_delegate.h
index 0efed290ddec20a24e2bcd2ff50834b49276508b..91ce94316f93bb39bbdfd529c0b7a05e0a8c15d4 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -16,7 +16,6 @@
 
 namespace content {
 
-class BrowserAccessibilityManager;
 class RenderWidgetHostImpl;
 struct NativeWebKeyboardEvent;
 
@@ -63,15 +62,8 @@
   // Notifies that RenderWidgetHost will toggle touch emulation.
   virtual void OnTouchEmulationEnabled(bool enabled) {}
 
-  // Get the root BrowserAccessibilityManager for this frame tree.
-  virtual BrowserAccessibilityManager* GetRootBrowserAccessibilityManager();
-
-  // Get the root BrowserAccessibilityManager for this frame tree,
-  // or create it if it doesn't exist.
-  virtual BrowserAccessibilityManager*
-      GetOrCreateRootBrowserAccessibilityManager();
-
 #if defined(OS_WIN)
+  // Returns the widget's parent's NativeViewAccessible.
   virtual gfx::NativeViewAccessible GetParentNativeViewAccessible();
 #endif