Revert "Add String resources for Background User sound notification"

This reverts commit 1fb02e3a19fb2948df1d21edceb3e0d681e2b7f3.

Reason for revert: <Likely culprit for b/335393084  - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.>

Change-Id: I68a5a6a5aa9a30a0c57793047ac890d3399c7f8a
diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index 58e1bb4..f3aa27f 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -6457,16 +6457,4 @@
     <string name="satellite_notification_how_it_works">How it works</string>
     <!-- Initial/System provided label shown for an app which gets unarchived. [CHAR LIMIT=64]. -->
     <string name="unarchival_session_app_label">Pending...</string>
-
-    <!-- Background user sound notification related messages -->
-    <!-- Notification title when sound comes from a call on background user [CHAR LIMIT=NOTIF_TITLE]-->
-    <string name="bg_user_sound_notification_title_call">Call for <xliff:g id="user_name" example="John Doe">%s</xliff:g></string>
-    <!-- Notification title when sound comes from an alarm or timer on background user [CHAR LIMIT=NOTIF_TITLE]-->
-    <string name="bg_user_sound_notification_title_alarm">Alarm for <xliff:g id="user_name" example="John Doe">%s</xliff:g></string>
-    <!-- Notification action button to prompt user switch to the background user [CHAR LIMIT=NONE] -->
-    <string name="bg_user_sound_notification_button_switch_user">Switch user</string>
-    <!-- Notification action button to mute the sound from the background user [CHAR LIMIT=NONE] -->
-    <string name="bg_user_sound_notification_button_mute">Mute</string>
-    <!-- Notification content action to mute the sound from the background user [CHAR LIMIT=NOTIF_BODY]-->
-    <string name="bg_user_sound_notification_message">Tap to mute sound</string>
 </resources>
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 1385e68..c4033f2 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -5381,13 +5381,6 @@
   <java-symbol type="string" name="satellite_notification_how_it_works" />
   <java-symbol type="drawable" name="ic_satellite_alt_24px" />
 
-  <!-- System notification for background user sound -->
-  <java-symbol type="string" name="bg_user_sound_notification_title_call" />
-  <java-symbol type="string" name="bg_user_sound_notification_title_alarm" />
-  <java-symbol type="string" name="bg_user_sound_notification_button_switch_user" />
-  <java-symbol type="string" name="bg_user_sound_notification_button_mute" />
-  <java-symbol type="string" name="bg_user_sound_notification_message" />
-
   <!-- DisplayManager configs. -->
   <java-symbol type="bool" name="config_evenDimmerEnabled" />