ntp: remove ShownSectionHandler and all references to it

chrome/browser/ui/webui/ntp/shown_sections_handler.cc

-// Copyright (c) 2011 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 "chrome/browser/ui/webui/ntp/shown_sections_handler.h"
-
-#include <string>
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/command_line.h"
-#include "base/string_number_conversions.h"
-#include "base/values.h"
-#include "chrome/browser/prefs/pref_service.h"
-#include "chrome/browser/profiles/profile.h"
-#include "chrome/common/chrome_notification_types.h"
-#include "chrome/common/extensions/extension.h"
-#include "chrome/common/pref_names.h"
-#include "content/browser/user_metrics.h"
-#include "content/public/browser/notification_details.h"
-
-namespace {
-
-// Will cause an UMA notification if the mode of the new tab page
-// was changed to hide/show the most visited thumbnails.
-// TODO(aa): Needs to be updated to match newest NTP - http://crbug.com/57440
-void NotifySectionDisabled(int new_mode, int old_mode, Profile *profile) {
-  // If the oldmode HAD either thumbs or lists visible.
-  bool old_had_it = (old_mode & THUMB) && !(old_mode & MENU_THUMB);
-  bool new_has_it = (new_mode & THUMB) && !(new_mode & MENU_THUMB);
-
-  if (old_had_it && !new_has_it) {
-    UserMetrics::RecordAction(
-        UserMetricsAction("ShowSections_RecentSitesDisabled"));
-  }
-
-  if (new_has_it && !old_had_it) {
-    UserMetrics::RecordAction(
-        UserMetricsAction("ShowSections_RecentSitesEnabled"));
-  }
-}
-
-}  // namespace
-
-// static
-int ShownSectionsHandler::GetShownSections(PrefService* prefs) {
-  return prefs->GetInteger(prefs::kNTPShownSections);
-}
-
-// static
-void ShownSectionsHandler::SetShownSection(PrefService* prefs,
-                                           Section section) {
-  int shown_sections = GetShownSections(prefs);
-  shown_sections &= ~ALL_SECTIONS_MASK;
-  shown_sections |= section;
-  prefs->SetInteger(prefs::kNTPShownSections, shown_sections);
-}
-
-ShownSectionsHandler::ShownSectionsHandler(PrefService* pref_service)
-    : pref_service_(pref_service) {
-  pref_registrar_.Init(pref_service);
-  pref_registrar_.Add(prefs::kNTPShownSections, this);
-}
-
-void ShownSectionsHandler::RegisterMessages() {
-  web_ui_->RegisterMessageCallback("setShownSections",
-      base::Bind(&ShownSectionsHandler::HandleSetShownSections,
-                 base::Unretained(this)));
-}
-
-void ShownSectionsHandler::Observe(
-    int type,
-    const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
-  if (type == chrome::NOTIFICATION_PREF_CHANGED) {
-    std::string* pref_name = content::Details<std::string>(details).ptr();
-    DCHECK(*pref_name == prefs::kNTPShownSections);
-    int sections = pref_service_->GetInteger(prefs::kNTPShownSections);
-    base::FundamentalValue sections_value(sections);
-    web_ui_->CallJavascriptFunction("setShownSections", sections_value);
-  } else {
-    NOTREACHED();
-  }
-}
-
-void ShownSectionsHandler::HandleSetShownSections(const ListValue* args) {
-  double mode_double;
-  CHECK(args->GetDouble(0, &mode_double));
-  int mode = static_cast<int>(mode_double);
-  int old_mode = pref_service_->GetInteger(prefs::kNTPShownSections);
-
-  if (old_mode != mode) {
-    NotifySectionDisabled(mode, old_mode, Profile::FromWebUI(web_ui_));
-    pref_service_->SetInteger(prefs::kNTPShownSections, mode);
-  }
-}
-
-// static
-void ShownSectionsHandler::RegisterUserPrefs(PrefService* pref_service) {
-#if defined(OS_CHROMEOS)
-  // Default to have expanded APPS and all other sections are minimized.
-  pref_service->RegisterIntegerPref(prefs::kNTPShownSections,
-                                    APPS | MENU_THUMB | MENU_RECENT,
-                                    PrefService::UNSYNCABLE_PREF);
-#else
-  pref_service->RegisterIntegerPref(prefs::kNTPShownSections,
-                                    THUMB,
-                                    PrefService::UNSYNCABLE_PREF);
-#endif
-}
-
-// static
-void ShownSectionsHandler::MigrateUserPrefs(PrefService* pref_service,
-                                            int old_pref_version,
-                                            int new_pref_version) {
-  // Nothing to migrate for default kNTPShownSections value.
-  const PrefService::Preference* shown_sections_pref =
-      pref_service->FindPreference(prefs::kNTPShownSections);
-  if (!shown_sections_pref || shown_sections_pref->IsDefaultValue())
-    return;
-
-  bool changed = false;
-  int shown_sections = pref_service->GetInteger(prefs::kNTPShownSections);
-
-  if (old_pref_version < 3) {
-    // In version 3, we went from being able to show multiple sections to being
-    // able to show only one expanded at a time. The only two expandable
-    // sections are APPS and THUMBS.
-    if (shown_sections & APPS)
-      shown_sections = APPS;
-    else
-      shown_sections = THUMB;
-
-    changed = true;
-  }
-
-  if (changed)
-    pref_service->SetInteger(prefs::kNTPShownSections, shown_sections);
-}
-
-// static
-void ShownSectionsHandler::OnExtensionInstalled(PrefService* prefs,
-                                                const Extension* extension) {
-  if (extension->is_app()) {
-    int mode = prefs->GetInteger(prefs::kNTPShownSections);
-
-    // De-menu-mode the apps section.
-    mode &= ~MENU_APPS;
-
-    // Hide any open sections.
-    mode &= ~ALL_SECTIONS_MASK;
-
-    // Show the apps section.
-    mode |= APPS;
-
-    prefs->SetInteger(prefs::kNTPShownSections, mode);
-  }
-}