Update event states in Env when target window has been destroyed.

ui/aura/env_input_state_controller.cc

Index: ui/aura/env_input_state_controller.cc
diff --git a/ui/aura/env_input_state_controller.cc b/ui/aura/env_input_state_controller.cc
index 7267f9f730fb16acf3731785463188ac560b774c..d856b496821d72741ab4553e25e6baa16dd46b26 100644
--- a/ui/aura/env_input_state_controller.cc
+++ b/ui/aura/env_input_state_controller.cc
@@ -26,7 +26,9 @@ void EnvInputStateController::UpdateStateForMouseEvent(
       break;
   }
 
-  if (event.type() != ui::ET_MOUSE_CAPTURE_CHANGED &&
+  // If |window| is null, we are only using |event| to update event states, so
+  // we shouldn't update mouse location.
+  if (window && event.type() != ui::ET_MOUSE_CAPTURE_CHANGED &&
       !(event.flags() & ui::EF_IS_SYNTHESIZED)) {
     SetLastMouseLocation(window, event.root_location());
   }