Make sure that we're restoring focus to a valid subview. (with Rohit)...

chrome/browser/renderer_host/render_widget_host_view_mac.mm

Index: chrome/browser/renderer_host/render_widget_host_view_mac.mm
===================================================================
--- chrome/browser/renderer_host/render_widget_host_view_mac.mm	(revision 16984)
+++ chrome/browser/renderer_host/render_widget_host_view_mac.mm	(working copy)
@@ -455,8 +455,12 @@
 }
 
 - (BOOL)becomeFirstResponder {
+  if (![self superview]) {

[pink (ping after 24hrs), 2009/05/28 12:35:23]

I usually check [self window] when determining if I'm in the view hierarchy or
not, since you could have a parent (maybe a NSScrollView or something) but still
be dying. We know a little better in this case, but it still pays to be safe in
case our hierarchy changes, no?

+    // We're dead, so becoming first responder is probably a bad idea.
+    return NO;
+  }
+  
   renderWidgetHostView_->render_widget_host_->Focus();
-
   return YES;
 }