Revert r128507 "Revert r128436 "relanding: disabled workspace_window_resizer test. fixed access-aft…

ui/aura/dispatcher_linux.cc

Index: ui/aura/dispatcher_linux.cc
diff --git a/ui/aura/dispatcher_linux.cc b/ui/aura/dispatcher_linux.cc
index 9603d118ba06e4f3568c5e96d0be5f7dc6318956..8fbf7f401118900493042d936259c4be7bf55505 100644
--- a/ui/aura/dispatcher_linux.cc
+++ b/ui/aura/dispatcher_linux.cc
@@ -23,12 +23,15 @@ void DispatcherLinux::RootWindowHostCreated(::Window window,
                                             ::Window root,
                                             RootWindowHostLinux* host) {
   hosts_.insert(std::make_pair(window, host));
-  hosts_.insert(std::make_pair(root, host));
+  // Only the 1st root window listens to the root window.
+  if (hosts_.find(root) == hosts_.end())
+    hosts_.insert(std::make_pair(root, host));
 }
 
 void DispatcherLinux::RootWindowHostDestroying(::Window window, ::Window root) {
+  if (hosts_[window] == hosts_[root])
+    hosts_.erase(root);
   hosts_.erase(window);
-  hosts_.erase(root);
 }
 
 base::MessagePumpDispatcher::DispatchStatus DispatcherLinux::Dispatch(