Commander: fix typo

Bug: 1014639
Change-Id: I550f129e9a72cc371b5bdfa06be3c38280c10db5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450703
Auto-Submit: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813958}

chrome/browser/ui/webui/commander/commander_handler.cc

@@ -22,7 +22,7 @@ constexpr char kActionKey[] = "action";
 constexpr char kResultSetIdKey[] = "result_set_id";
 constexpr char kTitleKey[] = "title";
 constexpr char kEntityKey[] = "entity";
-constexpr char kAnnotationKey[] = "annotations";
+constexpr char kAnnotationKey[] = "annotation";
 constexpr char kMatchedRangesKey[] = "matched_ranges";
 constexpr char kOptionsKey[] = "options";
 }  // namespace