Fix a few lingering bugs in BrowserAccessibilityManager and BrowserAccessibilityCocoa.

chrome/browser/renderer_host/render_widget_host_view_win.cc

Index: chrome/browser/renderer_host/render_widget_host_view_win.cc
diff --git a/chrome/browser/renderer_host/render_widget_host_view_win.cc b/chrome/browser/renderer_host/render_widget_host_view_win.cc
index a675936c059c946ef883f58e4f121f8d1bcf7b0b..bc3ec34225691b9c279fccc040505e7b1832fd3e 100644
--- a/chrome/browser/renderer_host/render_widget_host_view_win.cc
+++ b/chrome/browser/renderer_host/render_widget_host_view_win.cc
@@ -1444,7 +1444,10 @@ void RenderWidgetHostViewWin::OnAccessibilityNotifications(
   if (!browser_accessibility_manager_.get()) {
     // Use empty document to process notifications
     webkit_glue::WebAccessibility empty_document;
-    empty_document.role = WebAccessibility::ROLE_DOCUMENT;
+    // Renderer id's always start at 1000 as determined by webkit. Boot strap
+    // our ability to reuse BrowserAccessibility instances.
+    empty_document.id = 1000;
+    empty_document.role = WebAccessibility::ROLE_WEB_AREA;
     empty_document.state = 0;
     browser_accessibility_manager_.reset(
         BrowserAccessibilityManager::Create(m_hWnd, empty_document, this));
@@ -1626,7 +1629,8 @@ IAccessible* RenderWidgetHostViewWin::GetIAccessible() {
   if (!browser_accessibility_manager_.get()) {
     // Return busy document tree while renderer accessibility tree loads.
     webkit_glue::WebAccessibility loading_tree;
-    loading_tree.role = WebAccessibility::ROLE_DOCUMENT;
+    loading_tree.id = 1000;
+    loading_tree.role = WebAccessibility::ROLE_WEB_AREA;
     loading_tree.state = (1 << WebAccessibility::STATE_BUSY);
     browser_accessibility_manager_.reset(
       BrowserAccessibilityManager::Create(m_hWnd, loading_tree, this));