[Autofill] Fix crash in AutofillPopupViewNativeViews

This CL checks body_container_ for nullness.
body_container_ could be null if there are only footer items.

Bug: 1113255,1108181
Change-Id: I9ed145c1d18baf8b13deab8c44cc510b3bb781eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339479
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795409}

chrome/browser/ui/views/autofill/autofill_popup_view_native_views.cc

@@ -1227,7 +1227,7 @@ bool AutofillPopupViewNativeViews::DoUpdateBoundsAndRedrawPopup() {
   element_bounds.Inset(/*horizontal=*/0, /*vertical=*/-kElementBorderPadding);
 
   int item_height =
-      body_container_->children().size() > 0
+      body_container_ && body_container_->children().size() > 0
           ? body_container_->children()[0]->GetPreferredSize().height()
           : 0;
   if (!HasEnoughHeightForOneRow(item_height, GetContentAreaBounds(),
@@ -1242,7 +1242,7 @@ bool AutofillPopupViewNativeViews::DoUpdateBoundsAndRedrawPopup() {
   // Adjust the width to compensate for a scroll bar, if necessary, and for
   // other rules.
   int scroll_width = 0;
-  if (preferred_size.height() > popup_bounds.height()) {
+  if (scroll_view_ && preferred_size.height() > popup_bounds.height()) {
     preferred_size.set_height(popup_bounds.height());
 
     // Because the preferred size is greater than the bounds available, the

chrome/browser/ui/views/autofill/autofill_popup_view_native_views_unittest.cc

@@ -124,6 +124,19 @@ TEST_F(AutofillPopupViewNativeViewsTest, ShowHideTest) {
   view()->Hide();
 }
 
+// This is a regression test for crbug.com/1113255
+TEST_F(AutofillPopupViewNativeViewsTest,
+       ShowViewWithOnlyFooterItemsShouldNotCrash) {
+  // Set suggestions to have only a footer item.
+  autofill_popup_controller_.set_suggestions(
+      {autofill::PopupItemId::POPUP_ITEM_ID_CLEAR_FORM});
+  view_ = std::make_unique<autofill::AutofillPopupViewNativeViews>(
+      &autofill_popup_controller_, widget_.get());
+  widget_->SetContentsView(view_.get());
+  widget_->Show();
+  view_->Show();
+}
+
 TEST_F(AutofillPopupViewNativeViewsTest, AccessibilitySelectedEvent) {
   TestAXEventObserver observer;
   CreateAndShowView({autofill::POPUP_ITEM_ID_AUTOCOMPLETE_ENTRY,