[NTP Snippets] Replace the "DisableSnippets" pref by an "Enable" one

components/ntp_snippets/ntp_snippets_status_service_unittest.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/ntp_snippets_status_service.h"
 
 #include <memory>
 
 #include "components/ntp_snippets/ntp_snippets_test_utils.h"
 #include "components/ntp_snippets/pref_names.h"
@@ skipping 58 matching lines @@
   // Sync disabled.
   mock_sync_service()->can_sync_start_ = false;
   EXPECT_EQ(DisabledReason::SYNC_DISABLED,
             service()->GetDisabledReasonFromDeps());
 }
 
 TEST_F(NTPSnippetsStatusServiceTest, DisabledViaPref) {
   // The default test setup is signed out.
   ASSERT_EQ(DisabledReason::SIGNED_OUT, service()->GetDisabledReasonFromDeps());
 
-  // Once the disabled pref is set, we should be disabled.
-  pref_service()->SetBoolean(prefs::kDisableSnippets, true);
+  // Once the enabled pref is set to false, we should be disabled.
+  pref_service()->SetBoolean(prefs::kEnableSnippets, false);
   EXPECT_EQ(DisabledReason::EXPLICITLY_DISABLED,
             service()->GetDisabledReasonFromDeps());
 
   // The other dependencies shouldn't matter anymore.
   fake_signin_manager()->SignIn("foo@bar.com");
   EXPECT_EQ(DisabledReason::EXPLICITLY_DISABLED,
             service()->GetDisabledReasonFromDeps());
 
   mock_sync_service()->active_data_types_ = syncer::ModelTypeSet();
   EXPECT_EQ(DisabledReason::EXPLICITLY_DISABLED,
             service()->GetDisabledReasonFromDeps());
 
   mock_sync_service()->is_encrypt_everything_enabled_ = true;
   EXPECT_EQ(DisabledReason::EXPLICITLY_DISABLED,
             service()->GetDisabledReasonFromDeps());
 
   mock_sync_service()->configuration_done_ = false;
   EXPECT_EQ(DisabledReason::EXPLICITLY_DISABLED,
             service()->GetDisabledReasonFromDeps());
 
   mock_sync_service()->can_sync_start_ = false;
   EXPECT_EQ(DisabledReason::EXPLICITLY_DISABLED,
             service()->GetDisabledReasonFromDeps());
 }
 
 }  // namespace ntp_snippets