Remove unused MediaDevicesSelectionHandler from chrome://os-settings.

Bug: None
Change-Id: I403ae122bf417f3474f15157f23a67a96c3919a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2155280
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760274}

chrome/browser/ui/webui/settings/chromeos/os_settings_ui.cc

@@ -83,7 +83,6 @@
 #include "chrome/browser/ui/webui/settings/reset_settings_handler.h"
 #include "chrome/browser/ui/webui/settings/search_engines_handler.h"
 #include "chrome/browser/ui/webui/settings/settings_cookies_view_handler.h"
-#include "chrome/browser/ui/webui/settings/settings_media_devices_selection_handler.h"
 #include "chrome/browser/ui/webui/settings/shared_settings_localized_strings_provider.h"
 #include "chrome/browser/ui/webui/settings/tts_handler.h"
 #include "chrome/browser/ui/webui/webui_util.h"
@@ -155,8 +154,6 @@ OSSettingsUI::OSSettingsUI(content::WebUI* web_ui)
   AddSettingsPageUIHandler(std::make_unique<::settings::FontHandler>(web_ui));
   AddSettingsPageUIHandler(
       std::make_unique<::settings::LanguagesHandler>(web_ui));
-  AddSettingsPageUIHandler(
-      std::make_unique<::settings::MediaDevicesSelectionHandler>(profile));
   if (chromeos::features::IsSplitSettingsSyncEnabled())
     AddSettingsPageUIHandler(std::make_unique<OSSyncHandler>(profile));
   AddSettingsPageUIHandler(