Remove strings marked as deprecated that are no longer being used. (#19060)

app/src/main/res/values/strings.xml

@@ -776,8 +776,6 @@
     <string name="bookmark_delete_folder_snackbar">Deleted %1$s</string>
     <!-- Screen title for adding a bookmarks folder -->
     <string name="bookmark_add_folder">Add folder</string>
-    <!-- deprecated: Snackbar title shown after a bookmark has been created. -->
-    <string name="bookmark_created_snackbar">Bookmark created.</string>
     <!-- Snackbar title shown after a bookmark has been created. -->
     <string name="bookmark_saved_snackbar">Bookmark saved!</string>
     <!-- Snackbar edit button shown after a bookmark has been created. -->
@@ -1712,19 +1710,6 @@
     <!-- Content description for close button in collection placeholder. -->
     <string name="remove_home_collection_placeholder_content_description">Remove</string>
 
-    <!-- Deprecated: text for the firefox account onboarding card header
-    The first parameter is the name of the app (e.g. Firefox Preview) -->
-    <string name="onboarding_firefox_account_header">Get the most out of %s.</string>
-
     <!-- Content description radio buttons with a link to more information -->
     <string name="radio_preference_info_content_description">Click for more details</string>
-
-    <!-- Deprecated: No Open Tabs Message Header -->
-    <string name="no_collections_header1">Collect the things that matter to you</string>
-    <!-- Deprecated: Label to describe what collections are to a new user without any collections -->
-    <string name="no_collections_description1">Group together similar searches, sites, and tabs for quick access later.</string>
-    <!-- Deprecated: text for the firefox account onboarding card header when we detect you're already signed in to -->
-    <string name="onboarding_firefox_account_auto_signin_header_2">You are signed in as %s on another Firefox browser on this phone. Would you like to sign in with this account?</string>
-    <!-- Deprecated: Describes the add to homescreen functionality -->
-    <string name="add_to_homescreen_description">You can easily add this website to your phone’s Home screen to have instant access and browse faster with an app-like experience.</string>
 </resources>