Fix for crash in GuestViewBase::FindReply.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 51f3bba4caad16978eb733a728677d84b7777844..c943c5f642b0432312c28a5d5c3d8c6d8ebfd0a1 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -5116,7 +5116,7 @@ void WebContentsImpl::NotifyFindReply(int request_id,
                                       const gfx::Rect& selection_rect,
                                       int active_match_ordinal,
                                       bool final_update) {
-  if (delegate_) {
+  if (delegate_ && !is_being_destroyed_) {
     delegate_->FindReply(this, request_id, number_of_matches, selection_rect,
                          active_match_ordinal, final_update);
   }