Fix bug where NVDA wouldn't enter browse mode on page load.

ui/accessibility/ax_tree.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/accessibility/ax_tree.h"
 
 #include <set>
 
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
@@ skipping 139 matching lines @@
   // conditions.
 
   // Look up the node by id. If it's not found, then either the root
   // of the tree is being swapped, or we're out of sync with the source
   // and this is a serious error.
   AXNode* node = GetFromId(src.id);
   AXNode* new_node = NULL;
   if (node) {
     update_state->pending_nodes.erase(node);
     node->SetData(src);
-    if (delegate_)
-      delegate_->OnNodeChanged(node);
   } else {
     if (src.role != AX_ROLE_ROOT_WEB_AREA) {
       error_ = base::StringPrintf(
           "%d is not in the tree and not the new root", src.id);
       return false;
     }
     new_node = CreateNode(NULL, src.id, 0);
     node = new_node;
     update_state->new_nodes.insert(node);
     node->SetData(src);
   }
 
+  if (delegate_)
+    delegate_->OnNodeChanged(node);
+
   // First, delete nodes that used to be children of this node but aren't
   // anymore.
   if (!DeleteOldChildren(node, src.child_ids)) {
     if (new_node)
       DestroyNodeAndSubtree(new_node);
     return false;
   }
 
   // Now build a new children vector, reusing nodes when possible,
   // and swap it in.
@@ skipping 75 matching lines @@
       update_state->pending_nodes.insert(child);
       update_state->new_nodes.insert(child);
     }
     new_children->push_back(child);
   }
 
   return success;
 }
 
 }  // namespace ui