Merge 184586 "Fix heap-use-after-free in BookmarksIOFunction::Sh..."

chrome/browser/extensions/api/bookmarks/bookmarks_api.cc

Index: chrome/browser/extensions/api/bookmarks/bookmarks_api.cc
===================================================================
--- chrome/browser/extensions/api/bookmarks/bookmarks_api.cc	(revision 187459)
+++ chrome/browser/extensions/api/bookmarks/bookmarks_api.cc	(working copy)
@@ -915,6 +915,9 @@
 void BookmarksIOFunction::ShowSelectFileDialog(
     ui::SelectFileDialog::Type type,
     const base::FilePath& default_path) {
+  if (!dispatcher())
+    return;  // Extension was unloaded.
+
   // Balanced in one of the three callbacks of SelectFileDialog:
   // either FileSelectionCanceled, MultiFilesSelected, or FileSelected
   AddRef();