arc: Fix crash in ARC app search provider (multi-profile mode)

We allow using multiple profiles but ARC works only with primary. This
checks this condition (wider case) and does not create provider.

TEST=Manually. no longer crash.
BUG=891749

Change-Id: I706f2c4c6f10e0eb889d52d546d4a7bc34459d99
Reviewed-on: https://chromium-review.googlesource.com/c/1277377
Commit-Queue: Yury Khmel <khmel@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#598898}

chrome/browser/ui/app_list/search/search_controller_factory.cc

@@ -11,6 +11,7 @@
 #include "base/strings/string_util.h"
 #include "base/time/default_clock.h"
 #include "build/build_config.h"
+#include "chrome/browser/chromeos/arc/arc_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/app_list/search/answer_card/answer_card_search_provider.h"
 #include "chrome/browser/ui/app_list/search/answer_card/answer_card_web_contents.h"
@@ -138,7 +139,8 @@ std::unique_ptr<SearchController> CreateSearchController(
         std::make_unique<SettingsShortcutProvider>(profile));
   }
 
-  if (app_list_features::IsAppShortcutSearchEnabled()) {
+  if (app_list_features::IsAppShortcutSearchEnabled() &&
+      arc::IsArcAllowedForProfile(profile)) {
     size_t app_shortcut_group_id =
         controller->AddGroup(kMaxAppShortcutResults, 1.0, kBoostOfApps);
     controller->AddProvider(