Mark a state as unreachable in SearchTabHelper::FocusOmnibox().

Change-Id: If3b12f9ef36d20c43283fba936bdf4f9be7c1889
Reviewed-on: https://chromium-review.googlesource.com/1214742Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589973}

chrome/browser/ui/search/search_tab_helper.cc

@@ -258,8 +258,7 @@ void SearchTabHelper::FocusOmnibox(OmniboxFocusState state) {
   // doing nothing instead of crashing the browser process (intentional no-op).
   switch (state) {
     case OMNIBOX_FOCUS_VISIBLE:
-      omnibox_view->SetFocus();
-      omnibox_view->model()->SetCaretVisibility(true);
+      NOTREACHED();
       break;
     case OMNIBOX_FOCUS_INVISIBLE:
       omnibox_view->SetFocus();