Fall back to Wi-Fi data display in data usage screen with no SIM.

Bug: 70950124

Test: manual
Test: make RunSettingsRoboTests
Change-Id: I06bf78e54119819be87e15baca7e5b6a241958cb
diff --git a/src/com/android/settings/SettingsPreferenceFragment.java b/src/com/android/settings/SettingsPreferenceFragment.java
index bf4da66..95a039b 100644
--- a/src/com/android/settings/SettingsPreferenceFragment.java
+++ b/src/com/android/settings/SettingsPreferenceFragment.java
@@ -375,7 +375,8 @@
         return mPreferenceCache != null ? mPreferenceCache.size() : 0;
     }
 
-    protected boolean removePreference(String key) {
+    @VisibleForTesting(otherwise = VisibleForTesting.PROTECTED)
+    public boolean removePreference(String key) {
         return removePreference(getPreferenceScreen(), key);
     }