[NTP Snippets] Cleanups from clang-tidy

components/ntp_snippets/ntp_snippets_service_unittest.cc

Index: components/ntp_snippets/ntp_snippets_service_unittest.cc
diff --git a/components/ntp_snippets/ntp_snippets_service_unittest.cc b/components/ntp_snippets/ntp_snippets_service_unittest.cc
index a2e4abccee49cf86e622da52ddb13f1623485612..79e70483809068c488d850efd0277fd063937bcf 100644
--- a/components/ntp_snippets/ntp_snippets_service_unittest.cc
+++ b/components/ntp_snippets/ntp_snippets_service_unittest.cc
@@ -54,7 +54,6 @@ using testing::IsEmpty;
 using testing::Mock;
 using testing::MockFunction;
 using testing::NiceMock;
-using testing::Return;
 using testing::SaveArg;
 using testing::SizeIs;
 using testing::StartsWith;
@@ -350,7 +349,8 @@ class NTPSnippetsServiceTest : public ::testing::Test {
                           kTestContentSuggestionsServerEndpoint}}),
         fake_url_fetcher_factory_(
             /*default_factory=*/&failing_url_fetcher_factory_),
-        test_url_(kTestContentSuggestionsServerWithAPIKey) {
+        test_url_(kTestContentSuggestionsServerWithAPIKey),
+        image_fetcher_(nullptr) {
     NTPSnippetsService::RegisterProfilePrefs(utils_.pref_service()->registry());
     RequestThrottler::RegisterProfilePrefs(utils_.pref_service()->registry());