Extend LargeIconService to fetch missing favicons from a Google server

components/favicon/core/test/mock_favicon_service.h

Index: components/favicon/core/test/mock_favicon_service.h
diff --git a/components/favicon/core/test/mock_favicon_service.h b/components/favicon/core/test/mock_favicon_service.h
index 376a266a12b3277a0592b78e247883803146006a..fcd1a99dd652152a987054ab503b0de15a50b5df 100644
--- a/components/favicon/core/test/mock_favicon_service.h
+++ b/components/favicon/core/test/mock_favicon_service.h
@@ -102,6 +102,12 @@ class MockFaviconService : public FaviconService {
                     const GURL& icon_url,
                     favicon_base::IconType icon_type,
                     const gfx::Image& image));
+  MOCK_METHOD5(SetLastResortFavicons,
+               void(const GURL& page_url,
+                    const GURL& icon_url,
+                    favicon_base::IconType icon_type,
+                    const gfx::Image& image,
+                    base::Callback<void(bool)> callback));
   MOCK_METHOD1(UnableToDownloadFavicon, void(const GURL& icon_url));
   MOCK_CONST_METHOD1(WasUnableToDownloadFavicon, bool(const GURL& icon_url));
   MOCK_METHOD0(ClearUnableToDownloadFavicons, void());