Break up gr-diff-utils into two files
diff-util is for generally working with diff related types, which
are also useful outside of gr-diff.
gr-diff-utils just keeps the utils that are only relevant internally
in gr-diff.
This makes forking embed/diff/... easier.
Release-Notes: skip
Change-Id: I927e987da59a760c38ac2d3e1af6b5c29889a29b
diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
index aa6bb7a4..6892188 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
@@ -96,7 +96,7 @@
getPatchRangeForCommentUrl,
isInBaseOfPatchRange,
} from '../../../utils/comment-util';
-import {isFileUnchanged} from '../../../embed/diff/gr-diff/gr-diff-utils';
+import {isFileUnchanged} from '../../../utils/diff-util';
import {Route, ViewState} from '../../../models/views/base';
import {Model} from '../../../models/model';
import {