Remove ChromeOS Audio preferences from incognito whitelist.

ChromeOS Audio 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.
This CL won't affect changes from Settings page.

Bug: 861722
Change-Id: Id4f4bf82494188ac4501248ffdf4867187b77d3d
Reviewed-on: https://chromium-review.googlesource.com/1176807Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583964}

chrome/browser/prefs/pref_service_incognito_whitelist.cc

@@ -38,7 +38,6 @@
 
 #if defined(OS_CHROMEOS)
 #include "ash/public/cpp/ash_pref_names.h"
-#include "chromeos/chromeos_pref_names.h"
 #include "ui/base/ime/chromeos/extension_ime_util.h"
 #endif  // defined(OS_CHROMEOS)
 
@@ -696,15 +695,6 @@ const char* const kTemporaryIncognitoWhitelist[] = {
     prefs::kAutoplayAllowed, prefs::kAutoplayWhitelist,
 #endif
 
-// chromeos/chromeos_pref_names.h
-#if defined(OS_CHROMEOS)
-    chromeos::prefs::kAudioDevicesMute,
-    chromeos::prefs::kAudioDevicesVolumePercent, chromeos::prefs::kAudioMute,
-    chromeos::prefs::kAudioOutputAllowed, chromeos::prefs::kAudioVolumePercent,
-    chromeos::prefs::kAudioDevicesState,
-    chromeos::prefs::kQuirksClientLastServerCheck,
-#endif  // defined(OS_CHROMEOS)
-
     // components/consent_auditor/pref_names.h
     consent_auditor::prefs::kLocalConsentsDictionary,