Extend FaviconService to support fetching favicons from a Google server

components/ntp_tiles/icon_cacher_impl_unittest.cc

Index: components/ntp_tiles/icon_cacher_impl_unittest.cc
diff --git a/components/ntp_tiles/icon_cacher_impl_unittest.cc b/components/ntp_tiles/icon_cacher_impl_unittest.cc
index f80289c8ae14b2fb75deb14249304bdab0ab18c4..14ac8e34e33430494f564a193035ff0b0585f1bb 100644
--- a/components/ntp_tiles/icon_cacher_impl_unittest.cc
+++ b/components/ntp_tiles/icon_cacher_impl_unittest.cc
@@ -50,7 +50,9 @@ class IconCacherTest : public ::testing::Test {
               GURL("http://url.google/favicon.ico"),
               GURL()),  // thumbnail, unused
         image_fetcher_(new ::testing::StrictMock<MockImageFetcher>),
-        favicon_service_(/*favicon_client=*/nullptr, &history_service_) {
+        favicon_service_(/*favicon_client=*/nullptr,
+                         &history_service_,
+                         nullptr) {
     CHECK(history_dir_.CreateUniqueTempDir());
     CHECK(history_service_.Init(
         history::HistoryDatabaseParams(history_dir_.GetPath(), 0, 0)));