Check that a view exists before sending an accessibility event.

ui/views/accessibility/ax_window_obj_wrapper.cc

Index: ui/views/accessibility/ax_window_obj_wrapper.cc
diff --git a/ui/views/accessibility/ax_window_obj_wrapper.cc b/ui/views/accessibility/ax_window_obj_wrapper.cc
index 0f08a3c8434892d11c5071a577d14714744b795b..d13669739b00c1bf5f6ef520baada946bd3c73fd 100644
--- a/ui/views/accessibility/ax_window_obj_wrapper.cc
+++ b/ui/views/accessibility/ax_window_obj_wrapper.cc
@@ -104,8 +104,10 @@ void AXWindowObjWrapper::OnWindowBoundsChanged(aura::Window* window,
 
   Widget* widget = Widget::GetWidgetForNativeView(window);
   if (widget) {
-    widget->GetRootView()->NotifyAccessibilityEvent(
-        ui::AX_EVENT_LOCATION_CHANGED, true);
+    views::View* view = widget->GetRootView();

[varkha, 2017/05/09 07:00:57]

nit: s/view/root_view

+    if (view) {

[varkha, 2017/05/09 07:00:57]

nit: no {}

+      view->NotifyAccessibilityEvent(ui::AX_EVENT_LOCATION_CHANGED, true);
+    }
   }
 }