[NTP Snippets] Cleanups from clang-tidy

components/ntp_snippets/ntp_snippets_status_service.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/ntp_snippets/ntp_snippets_status_service.h"
 
 #include <string>
 
 #include "components/ntp_snippets/features.h"
 #include "components/ntp_snippets/pref_names.h"
@@ skipping 23 matching lines @@
       kArticleSuggestionsFeature, kFetchingRequiresSignin);
   if (param_value_str == kFetchingRequiresSigninEnabled) {
     require_signin_ = true;
   } else if (!param_value_str.empty() &&
              param_value_str != kFetchingRequiresSigninDisabled) {
     DLOG(WARNING) << "Unknow value for the variations parameter "
                   << kFetchingRequiresSignin << ": " << param_value_str;
   }
 }
 
-NTPSnippetsStatusService::~NTPSnippetsStatusService() {}
+NTPSnippetsStatusService::~NTPSnippetsStatusService() = default;
 
 // static
 void NTPSnippetsStatusService::RegisterProfilePrefs(
     PrefRegistrySimple* registry) {
   registry->RegisterBooleanPref(prefs::kEnableSnippets, true);
 }
 
 void NTPSnippetsStatusService::Init(
     const DisabledReasonChangeCallback& callback) {
   DCHECK(disabled_reason_change_callback_.is_null());
@@ skipping 51 matching lines @@
       (!signin_manager_ || !signin_manager_->IsAuthenticated())) {
     DVLOG(1) << "[GetNewDisabledReason] Signed out";
     return DisabledReason::SIGNED_OUT;
   }
 
   DVLOG(1) << "[GetNewDisabledReason] Enabled";
   return DisabledReason::NONE;
 }
 
 }  // namespace ntp_snippets