Remove Network Time preferences from incognito whitelist.

Preferences related to network time are removed from the persistent
storage list for incognito mode.
After this CL, if these preferences are changed from incognito mode,
they are only stored in memory and won't affect user profile.

Bug: 861722
Change-Id: I7a37a22be09e21942e608b1f407b1d27704fa8fd
Reviewed-on: https://chromium-review.googlesource.com/1172134Reviewed-by: Nicolas Zea <zea@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583180}

chrome/browser/prefs/pref_service_incognito_whitelist.cc

@@ -17,7 +17,6 @@
 #include "components/invalidation/impl/invalidation_prefs.h"
 #include "components/language/core/browser/pref_names.h"
 #include "components/metrics/metrics_pref_names.h"
-#include "components/network_time/network_time_pref_names.h"
 #include "components/omnibox/browser/omnibox_pref_names.h"
 #include "components/onc/onc_pref_names.h"
 #include "components/proxy_config/proxy_config_pref_names.h"
@@ -776,10 +775,6 @@ const char* const kTemporaryIncognitoWhitelist[] = {
     // components/language/core/browser/pref_names.h
     language::prefs::kApplicationLocale, language::prefs::kUserLanguageProfile,
 
-    // components/network_time/network_time_pref_names.h
-    network_time::prefs::kNetworkTimeMapping,
-    network_time::prefs::kNetworkTimeQueriesEnabled,
-
     // components/omnibox/browser/omnibox_pref_names.h
     omnibox::kZeroSuggestCachedResults,