[NTP Snippets] Another round of clang-tidy cleanups

components/ntp_snippets/remote/ntp_snippets_fetcher.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/remote/ntp_snippets_fetcher.h"
 
 #include <cstdlib>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 346 matching lines @@
       // Wait until we get a refresh token.
       waiting_for_refresh_token_ = true;
       token_service_->AddObserver(this);
     }
   } else {
     // Not signed in: fetch snippets (without authentication).
     FetchSnippetsNonAuthenticated();
   }
 }
 
-NTPSnippetsFetcher::RequestParams::RequestParams()
-    : fetch_api(),
-      obfuscated_gaia_id(),
-      only_return_personalized_results(),
-      user_locale(),
-      host_restricts(),
-      count_to_fetch(),
-      interactive_request(),
-      user_class(),
-      ui_language{"", 0.0f},
-      other_top_language{"", 0.0f} {}
+NTPSnippetsFetcher::RequestParams::RequestParams() = default;
 
 NTPSnippetsFetcher::RequestParams::~RequestParams() = default;
 
 std::string NTPSnippetsFetcher::RequestParams::BuildRequest() {
   auto request = base::MakeUnique<base::DictionaryValue>();
   switch (fetch_api) {
     case CHROME_READER_API: {
       auto content_params = base::MakeUnique<base::DictionaryValue>();
       content_params->SetBoolean("only_return_personalized_results",
                                  only_return_personalized_results);
@@ skipping 402 matching lines @@
           interactive_request);
     case UserClassifier::UserClass::ACTIVE_SUGGESTIONS_CONSUMER:
       return request_throttler_active_suggestions_consumer_
           .DemandQuotaForRequest(interactive_request);
   }
   NOTREACHED();
   return false;
 }
 
 }  // namespace ntp_snippets