Always check if View::GetWidget() is NULL.

ui/views/accessibility/native_view_accessibility_win.cc

Index: ui/views/accessibility/native_view_accessibility_win.cc
diff --git a/ui/views/accessibility/native_view_accessibility_win.cc b/ui/views/accessibility/native_view_accessibility_win.cc
index 7aa92a2a13cfb33da5d81cbfb8c4aff6c0026237..358fc17b872ebf98e98871eb11d60fb2f0efaaa5 100644
--- a/ui/views/accessibility/native_view_accessibility_win.cc
+++ b/ui/views/accessibility/native_view_accessibility_win.cc
@@ -258,7 +258,7 @@ STDMETHODIMP NativeViewAccessibilityWin::accHitTest(
 
   // If this is a root view, our widget might have child widgets.
   // Search child widgets first, since they're on top in the z-order.
-  if (view_->GetWidget()->GetRootView() == view_) {
+  if (view_->GetWidget() && view_->GetWidget()->GetRootView() == view_) {
     std::vector<Widget*> child_widgets;
     PopulateChildWidgetVector(&child_widgets);
     for (size_t i = 0; i < child_widgets.size(); ++i) {
@@ -473,7 +473,7 @@ STDMETHODIMP NativeViewAccessibilityWin::get_accChild(VARIANT var_child,
 
   // If this is a root view, our widget might have child widgets. Include
   std::vector<Widget*> child_widgets;
-  if (view_->GetWidget()->GetRootView() == view_)
+  if (view_->GetWidget() && view_->GetWidget()->GetRootView() == view_)
     PopulateChildWidgetVector(&child_widgets);
   int child_widget_count = static_cast<int>(child_widgets.size());
 
@@ -540,7 +540,7 @@ STDMETHODIMP NativeViewAccessibilityWin::get_accChildCount(LONG* child_count) {
 
   // If this is a root view, our widget might have child widgets. Include
   // them, too.
-  if (view_->GetWidget()->GetRootView() == view_) {
+  if (view_->GetWidget() && view_->GetWidget()->GetRootView() == view_) {
     std::vector<Widget*> child_widgets;
     PopulateChildWidgetVector(&child_widgets);
     *child_count += child_widgets.size();
@@ -1392,6 +1392,9 @@ LONG NativeViewAccessibilityWin::FindBoundary(
 void NativeViewAccessibilityWin::PopulateChildWidgetVector(
     std::vector<Widget*>* result_child_widgets) {
   const Widget* widget = view()->GetWidget();
+  if (!widget)
+    return;
+
   std::set<Widget*> child_widgets;
   Widget::GetAllChildWidgets(widget->GetNativeView(), &child_widgets);
   Widget::GetAllOwnedWidgets(widget->GetNativeView(), &child_widgets);