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 a3bc1397b8f09563005da483ed09f2952ac3e55b..e7a436582f0ecd759160fe02fc946f82c46f5253 100644
--- a/content/browser/renderer_host/render_widget_host_delegate.h
+++ b/content/browser/renderer_host/render_widget_host_delegate.h
@@ -17,6 +17,7 @@ class WebGestureEvent;
 
 namespace content {
 
+class BrowserAccessibilityManager;
 class RenderWidgetHostImpl;
 struct NativeWebKeyboardEvent;
 
@@ -63,8 +64,15 @@ class CONTENT_EXPORT RenderWidgetHostDelegate {
   // 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