Remove DOM distiller preferences from incognito whitelist.

DOM distiller preferences 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: Icb08ad733b48a193c3ec52087d92decde6563191
Reviewed-on: https://chromium-review.googlesource.com/1179144Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584725}

chrome/browser/prefs/pref_service_incognito_whitelist.cc

@@ -11,7 +11,6 @@
 #include "chrome/common/pref_names.h"
 #include "components/bookmarks/common/bookmark_pref_names.h"
 #include "components/consent_auditor/pref_names.h"
-#include "components/dom_distiller/core/pref_names.h"
 #include "components/flags_ui/flags_ui_pref_names.h"
 #include "components/google/core/browser/google_pref_names.h"
 #include "components/invalidation/impl/invalidation_prefs.h"
@@ -632,11 +631,6 @@ const char* const kTemporaryIncognitoWhitelist[] = {
     // components/consent_auditor/pref_names.h
     consent_auditor::prefs::kLocalConsentsDictionary,
 
-    // components/dom_distiller/core/pref_names.h
-    dom_distiller::prefs::kFont, dom_distiller::prefs::kTheme,
-    dom_distiller::prefs::kFontScale,
-    dom_distiller::prefs::kReaderForAccessibility,
-
     // components/flags_ui/flags_ui_pref_names.h
     flags_ui::prefs::kEnabledLabsExperiments,