[autofill] Fix crash while closing tab or browser window with interactive

chrome/browser/autofill/autofill_manager.cc

Index: chrome/browser/autofill/autofill_manager.cc
diff --git a/chrome/browser/autofill/autofill_manager.cc b/chrome/browser/autofill/autofill_manager.cc
index aeeca26fbfef722c4a49830608ededf7de46c05d..73b1446718774323e8f0d7eab9a54bc5f701336b 100644
--- a/chrome/browser/autofill/autofill_manager.cc
+++ b/chrome/browser/autofill/autofill_manager.cc
@@ -779,6 +779,11 @@ void AutofillManager::OnRequestAutocomplete(const FormData& form) {
 }
 
 void AutofillManager::ReturnAutocompleteData(const FormStructure* result) {
+  // web_contents() will be NULL when the interactive autocomplete is closed due
+  // to a tab or browser window closing.
+  if (!web_contents())
+    return;
+
   RenderViewHost* host = web_contents()->GetRenderViewHost();
   if (!host)
     return;