Remove unused global variable with non-trivial constructor/destructor

chrome/browser/component_updater/chrome_component_updater_configurator_unittest.cc

 // Copyright 2015 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 <memory>
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/component_updater/chrome_component_updater_configurator.h"
 #include "components/component_updater/component_updater_switches.h"
 #include "components/component_updater/component_updater_url_constants.h"
 #include "components/component_updater/configurator_impl.h"
 #include "components/prefs/testing_pref_service.h"
 #include "components/update_client/configurator.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
-std::unique_ptr<TestingPrefServiceSimple> pref(new TestingPrefServiceSimple());
-
 namespace component_updater {
 
 class ChromeComponentUpdaterConfiguratorTest : public testing::Test {
  public:
   ChromeComponentUpdaterConfiguratorTest() {}
   ~ChromeComponentUpdaterConfiguratorTest() override{};
 
   // Overrides from testing::Test.
   void SetUp() override;
 
@@ skipping 136 matching lines @@
   // Sanity check setting the preference back to |false| and then removing it.
   pref_service()->SetManagedPref("component_updates.component_updates_enabled",
                                  new base::FundamentalValue(false));
   EXPECT_FALSE(config->EnabledComponentUpdates());
   pref_service()->RemoveManagedPref(
       "component_updates.component_updates_enabled");
   EXPECT_TRUE(config->EnabledComponentUpdates());
 }
 
 }  // namespace component_updater