Verify that previous_selected_line is within bounds before passing to

chrome/browser/ui/autofill/autofill_popup_controller_impl.cc

Index: chrome/browser/ui/autofill/autofill_popup_controller_impl.cc
diff --git a/chrome/browser/ui/autofill/autofill_popup_controller_impl.cc b/chrome/browser/ui/autofill/autofill_popup_controller_impl.cc
index b800e88cc141934f36e113db3cb1c86beb358449..619b9dd5078443e07f089538a73883c1481cf7bf 100644
--- a/chrome/browser/ui/autofill/autofill_popup_controller_impl.cc
+++ b/chrome/browser/ui/autofill/autofill_popup_controller_impl.cc
@@ -398,7 +398,11 @@ void AutofillPopupControllerImpl::SetSelectedLine(
       selected_line = base::nullopt;
   }
 
-  auto previous_selected_line(selected_line_);
+  base::Optional<int> previous_selected_line;
+  if (selected_line_ && *selected_line_ < suggestions_.size()) {
+    previous_selected_line = selected_line_;
+  }
+
   selected_line_ = selected_line;
   view_->OnSelectedRowChanged(previous_selected_line, selected_line_);