Remove ChromeOS Tethering preferences from incognito whitelist.

Preferences related to ChromeOS Thethering 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: I3faa7ad982ace7347a894f3f3225332d0a437ed0
Reviewed-on: https://chromium-review.googlesource.com/1158068Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579740}

chrome/browser/prefs/pref_service_incognito_whitelist.cc

@@ -52,7 +52,6 @@
 #include "chrome/browser/chromeos/crostini/crostini_pref_names.h"
 #include "chromeos/chromeos_pref_names.h"
 #include "chromeos/components/proximity_auth/proximity_auth_pref_names.h"
-#include "chromeos/components/tether/pref_names.h"
 #include "components/arc/arc_prefs.h"
 #include "components/cryptauth/pref_names.h"
 #include "components/drive/drive_pref_names.h"
@@ -209,8 +208,6 @@ const char* incognito_whitelist[] = {
     prefs::kQuickUnlockModeWhitelist, prefs::kQuickUnlockTimeout,
     prefs::kPinUnlockMinimumLength, prefs::kPinUnlockMaximumLength,
     prefs::kPinUnlockWeakPinsAllowed, prefs::kEnableQuickUnlockFingerprint,
-    prefs::kInstantTetheringAllowed, prefs::kInstantTetheringEnabled,
-    prefs::kInstantTetheringBleAdvertisingSupported,
     prefs::kCastReceiverEnabled, prefs::kMinimumAllowedChromeVersion,
     prefs::kShowSyncSettingsOnSessionStart, prefs::kTextToSpeechLangToVoiceName,
     prefs::kTextToSpeechRate, prefs::kTextToSpeechPitch,
@@ -712,18 +709,6 @@ const char* incognito_whitelist[] = {
     proximity_auth::prefs::kProximityAuthIsChromeOSLoginEnabled,
 #endif  // defined(OS_CHROMEOS)
 
-// chromeos/components/tether/pref_names.h
-#if defined(OS_CHROMEOS)
-    chromeos::tether::prefs::kMostRecentTetherAvailablilityResponderIds,
-    chromeos::tether::prefs::kMostRecentConnectTetheringResponderIds,
-    chromeos::tether::prefs::kActiveHostStatus,
-    chromeos::tether::prefs::kActiveHostDeviceId,
-    chromeos::tether::prefs::kTetherNetworkGuid,
-    chromeos::tether::prefs::kWifiNetworkGuid,
-    chromeos::tether::prefs::kDisconnectingWifiNetworkPath,
-    chromeos::tether::prefs::kHostScanCache,
-#endif  // defined(OS_CHROMEOS)
-
 // components/arc/arc_prefs.h
 #if defined(OS_CHROMEOS)
     arc::prefs::kArcActiveDirectoryPlayUserId, arc::prefs::kArcApps,