FilesApp fix DOMException: Failed to execute 'removeChild' on 'Node'

Bug: 813477
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: Iafe64af611275d2a434ad533c3c615a9ccb8abf5
Reviewed-on: https://chromium-review.googlesource.com/1119739
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571425}

ui/webui/resources/js/cr/ui/dialogs.js

@@ -277,7 +277,10 @@ cr.define('cr.ui.dialogs', function() {
     var self = this;
     setTimeout(function() {
       // Wait until the transition is done before removing the dialog.
-      self.parentNode_.removeChild(self.container_);
+      // It is possible to show/hide/show/hide and have hide called twice
+      // and container_ already removed from parentNode_.
+      if (self.parentNode_ === self.container_.parentNode)
+        self.parentNode_.removeChild(self.container_);
       if (opt_onHide)
         opt_onHide();
     }, BaseDialog.ANIMATE_STABLE_DURATION);