Adding CrHome-specific implementation for home page tile.

components/ntp_tiles/most_visited_sites_unittest.cc

Index: components/ntp_tiles/most_visited_sites_unittest.cc
diff --git a/components/ntp_tiles/most_visited_sites_unittest.cc b/components/ntp_tiles/most_visited_sites_unittest.cc
index 4bd8bc92ab524bb11b751e84a8e662f3acd5d666..eb592cb5bfbeab6b2c534fffc73c3f927f7cd576 100644
--- a/components/ntp_tiles/most_visited_sites_unittest.cc
+++ b/components/ntp_tiles/most_visited_sites_unittest.cc
@@ -373,7 +373,9 @@ class MostVisitedSitesTest : public ::testing::TestWithParam<bool> {
     most_visited_sites_ = base::MakeUnique<MostVisitedSites>(
         &pref_service_, mock_top_sites_, &mock_suggestions_service_,
         popular_sites_factory_.New(), std::move(icon_cacher),
-        /*supervisor=*/nullptr, std::move(home_page_client));
+        /*supervisor=*/nullptr);
+
+    most_visited_sites_->SetHomePageClient(std::move(home_page_client));
   }
 
   bool IsPopularSitesEnabledViaVariations() const { return GetParam(); }