Hide autofill popup before WebContentsImpl is destroyed.

components/autofill/core/browser/autofill_external_delegate.cc

Index: components/autofill/core/browser/autofill_external_delegate.cc
diff --git a/components/autofill/core/browser/autofill_external_delegate.cc b/components/autofill/core/browser/autofill_external_delegate.cc
index 4fca5220adbc669e5a3233ea6a3a5d9cb6fbf569..b493726ffa76b786c8e6767a44bc5e8fd1408a64 100644
--- a/components/autofill/core/browser/autofill_external_delegate.cc
+++ b/components/autofill/core/browser/autofill_external_delegate.cc
@@ -169,8 +169,11 @@ void AutofillExternalDelegate::OnPopupShown(
 
 void AutofillExternalDelegate::OnPopupHidden(
     content::KeyboardListener* listener) {
-  if (registered_keyboard_listener_with_ == web_contents_->GetRenderViewHost())
+  if ((!web_contents_->IsBeingDestroyed()) &&
+      (registered_keyboard_listener_with_ ==
+          web_contents_->GetRenderViewHost())) {
     web_contents_->GetRenderViewHost()->RemoveKeyboardListener(listener);
+  }
 
   registered_keyboard_listener_with_ = NULL;
 }