Move gr-diff-comment-thread factory to diff-host
This is now only used from there, so it no longer needs to be globally
accessible on Gerrit.
Change-Id: I6facd64ece360f5b8ddf7b801621e86bd5f39697
diff --git a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
index e5854011..b258455 100644
--- a/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
+++ b/polygerrit-ui/app/elements/diff/gr-diff/gr-diff.html
@@ -20,6 +20,7 @@
<link rel="import" href="../../../styles/shared-styles.html">
<link rel="import" href="../../shared/gr-button/gr-button.html">
<link rel="import" href="../gr-diff-builder/gr-diff-builder.html">
+<link rel="import" href="../gr-diff-comment-thread-group/gr-diff-comment-thread-group.html">
<link rel="import" href="../gr-diff-highlight/gr-diff-highlight.html">
<link rel="import" href="../gr-diff-selection/gr-diff-selection.html">
<link rel="import" href="../gr-syntax-themes/gr-syntax-theme.html">
