Adding unit tests for PreviewsOptOutStoreSQL

components/previews/core/BUILD.gn

Index: components/previews/core/BUILD.gn
diff --git a/components/previews/core/BUILD.gn b/components/previews/core/BUILD.gn
index 35153e2490e38abe065a341a80782152228588d9..253d762624f60f8a10b8e07538714b16a468c093 100644
--- a/components/previews/core/BUILD.gn
+++ b/components/previews/core/BUILD.gn
@@ -33,23 +33,26 @@ static_library("core") {
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "previews_black_list_item_unittest.cc",
     "previews_black_list_unittest.cc",
     "previews_data_savings_unittest.cc",
     "previews_experiments_unittest.cc",
     "previews_io_data_unittest.cc",
+    "previews_opt_out_store_sql_unittest.cc",
     "previews_ui_service_unittest.cc",
   ]
 
   deps = [
     ":core",
     "//base",
     "//base/test:test_support",
     "//components/data_reduction_proxy/core/common",
     "//components/variations",
+    "//sql",
+    "//sql:test_support",
     "//testing/gtest",
     "//url:url",
   ]
 }