[NTP Snippets] Cleanups from clang-tidy

components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.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/physical_web_pages/physical_web_page_suggestions_provider.h"
 
 #include "base/bind.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "ui/gfx/image/image.h"
 
 namespace ntp_snippets {
 
 namespace {
 
 const size_t kMaxSuggestionsCount = 10;
 
 }  // namespace
 
 // TODO(vitaliii): remove when Physical Web C++ interface is provided.
-UrlInfo::UrlInfo() {}
-UrlInfo::~UrlInfo() {}
+UrlInfo::UrlInfo() = default;
+UrlInfo::~UrlInfo() = default;
 UrlInfo::UrlInfo(const UrlInfo& other) = default;
 
 PhysicalWebPageSuggestionsProvider::PhysicalWebPageSuggestionsProvider(
     ContentSuggestionsProvider::Observer* observer,
     CategoryFactory* category_factory)
     : ContentSuggestionsProvider(observer, category_factory),
       category_status_(CategoryStatus::AVAILABLE_LOADING),
       provided_category_(category_factory->FromKnownCategory(
           KnownCategories::PHYSICAL_WEB_PAGES)) {
   observer->OnCategoryStatusChanged(this, provided_category_, category_status_);
 }
 
-PhysicalWebPageSuggestionsProvider::~PhysicalWebPageSuggestionsProvider() {}
+PhysicalWebPageSuggestionsProvider::~PhysicalWebPageSuggestionsProvider() =
+    default;
 
 void PhysicalWebPageSuggestionsProvider::OnDisplayableUrlsChanged(
     const std::vector<UrlInfo>& urls) {
   NotifyStatusChanged(CategoryStatus::AVAILABLE);
   std::vector<ContentSuggestion> suggestions;
 
   for (const UrlInfo& url_info : urls) {
     if (suggestions.size() >= kMaxSuggestionsCount) break;
 
     ContentSuggestion suggestion(
@@ skipping 67 matching lines @@
 
 // Updates the |category_status_| and notifies the |observer_|, if necessary.
 void PhysicalWebPageSuggestionsProvider::NotifyStatusChanged(
     CategoryStatus new_status) {
   if (category_status_ == new_status) return;
   category_status_ = new_status;
   observer()->OnCategoryStatusChanged(this, provided_category_, new_status);
 }
 
 }  // namespace ntp_snippets