Ignore accessibility events fired on objects that aren't in the tree.

content/renderer/accessibility/renderer_accessibility_complete.cc

Index: content/renderer/accessibility/renderer_accessibility_complete.cc
diff --git a/content/renderer/accessibility/renderer_accessibility_complete.cc b/content/renderer/accessibility/renderer_accessibility_complete.cc
index 4a9de8f017da41809f384d46e687d5b1ba59dbc4..c17b7417ca3a9411df703cab3435b63acfc2ee90 100644
--- a/content/renderer/accessibility/renderer_accessibility_complete.cc
+++ b/content/renderer/accessibility/renderer_accessibility_complete.cc
@@ -186,6 +186,8 @@ void RendererAccessibilityComplete::SendPendingAccessibilityEvents() {
         event.id);
     if (!obj.updateBackingStoreAndCheckValidity())
       continue;
+    if (!tree_source_.IsInTree(obj))

[Peter Lundblad, 2014/05/07 23:03:24]

Can you add some brief comment why the node wouldn't be in the tree?

[dmazzoni, 2014/05/08 15:12:23]

Done.

+      continue;
 
     // When we get a "selected children changed" event, Blink
     // doesn't also send us events for each child that changed