Messaging: Remove low storage handling

* SMS are the least of your storage issues, if you reach the limit
* Both Intent.ACTION_DEVICE_STORAGE_LOW and
  Intent.ACTION_DEVICE_STORAGE_LOW are not delivered to apps after O
* Remove all now unused strings from all languages - we don't sync those
  with crowdin (yet)

Change-Id: If01f937acdafbb34d5a9e792db54de4761ec4cc5

src/com/android/messaging/ui/UIIntentsImpl.java

@@ -152,13 +152,6 @@ public class UIIntentsImpl extends UIIntents {
         context.startActivity(intent);
     }
 
-    /**
-     * Get an intent which shows the low storage warning activity.
-     */
-    private Intent getSmsStorageLowWarningActivityIntent(final Context context) {
-        return new Intent(context, SmsStorageLowWarningActivity.class);
-    }
-
     @Override
     public void launchConversationActivity(final Context context,
             final String conversationId, final MessageData draft, final Bundle activityOptions,
@@ -450,18 +443,6 @@ public class UIIntentsImpl extends UIIntents {
         return resultPendingIntent;
     }
 
-    @Override
-    public PendingIntent getPendingIntentForLowStorageNotifications(final Context context) {
-        final TaskStackBuilder taskStackBuilder = TaskStackBuilder.create(context);
-        final Intent conversationListIntent = getConversationListActivityIntent(context);
-        taskStackBuilder.addNextIntent(conversationListIntent);
-        taskStackBuilder.addNextIntentWithParentStack(
-                getSmsStorageLowWarningActivityIntent(context));
-
-        return taskStackBuilder.getPendingIntent(
-                0, PendingIntent.FLAG_UPDATE_CURRENT);
-    }
-
     @Override
     public PendingIntent getPendingIntentForSecondaryUserNewMessageNotification(
             final Context context) {