Refactor search_engines tests to better reuse code

components/search_engines/default_search_pref_test_util.h

-// Copyright 2014 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.
-
-#ifndef COMPONENTS_SEARCH_ENGINES_DEFAULT_SEARCH_PREF_TEST_UTIL_H_
-#define COMPONENTS_SEARCH_ENGINES_DEFAULT_SEARCH_PREF_TEST_UTIL_H_
-
-#include <memory>
-#include <string>
-
-#include "base/values.h"
-#include "components/search_engines/default_search_manager.h"
-
-class DefaultSearchPrefTestUtil {
- public:
-  // Creates a DictionaryValue which can be used as a
-  // kDefaultSearchProviderDataPrefName preference value.
-  static std::unique_ptr<base::DictionaryValue>
-  CreateDefaultSearchPreferenceValue(
-      bool enabled,
-      const std::string& name,
-      const std::string& keyword,
-      const std::string& search_url,
-      const std::string& suggest_url,
-      const std::string& icon_url,
-      const std::string& encodings,
-      const std::string& alternate_url,
-      const std::string& search_terms_replacement_key);
-
-  // Set the managed preferences for the default search provider and trigger
-  // notification. If |alternate_url| is empty, uses an empty list of alternate
-  // URLs, otherwise use a list containing a single entry.
-  template<typename TestingPrefService>
-  static void SetManagedPref(TestingPrefService* pref_service,
-                             bool enabled,
-                             const std::string& name,
-                             const std::string& keyword,
-                             const std::string& search_url,
-                             const std::string& suggest_url,
-                             const std::string& icon_url,
-                             const std::string& encodings,
-                             const std::string& alternate_url,
-                             const std::string& search_terms_replacement_key) {
-    pref_service->SetManagedPref(
-        DefaultSearchManager::kDefaultSearchProviderDataPrefName,
-        CreateDefaultSearchPreferenceValue(
-            enabled, name, keyword, search_url, suggest_url, icon_url,
-            encodings, alternate_url, search_terms_replacement_key).release());
-  }
-
-  // Remove all the managed preferences for the default search provider and
-  // trigger notification.
-  template<typename TestingPrefService>
-  static void RemoveManagedPref(TestingPrefService* pref_service) {
-    pref_service->RemoveManagedPref(
-        DefaultSearchManager::kDefaultSearchProviderDataPrefName);
-  }
-};
-
-#endif  // COMPONENTS_SEARCH_ENGINES_DEFAULT_SEARCH_PREF_TEST_UTIL_H_