Clean up unused operator_warning

Usage is removed in Change I9781af3a53fe7050b414f0574abb7618f8d71707.

Bug: 285231003
Test: m Settings
Change-Id: I89fb8630cc6bea4828b14936d5e2234de9f232ea
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 288d346..aa69cb8 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -9553,9 +9553,6 @@
     <!-- Format for a summary describing the amount of data before the user is warned or limited [CHAR LIMIT=NONE] -->
     <string name="cell_data_warning_and_limit"><xliff:g name="amount" example="1 GB">^1</xliff:g> data warning / <xliff:g name="amount" example="2 GB">^2</xliff:g> data limit</string>
 
-    <!-- A summary shown on data usage screens to indicate inaccuracy of data tracking [CHAR LIMIT=NONE] -->
-    <string name="operator_warning">Carrier data accounting may differ from device accounting</string>
-
     <!-- A summary shown on data usage screens to indicate data tracking excluded from carrier networks [CHAR LIMIT=NONE] -->
     <string name="non_carrier_data_usage_warning">Excludes data used by carrier networks</string>
 
diff --git a/res/xml/data_usage_list.xml b/res/xml/data_usage_list.xml
index 644fca4..28f09c6 100644
--- a/res/xml/data_usage_list.xml
+++ b/res/xml/data_usage_list.xml
@@ -24,11 +24,6 @@
             android:key="chart_data" />
 
         <Preference
-            android:key="operator_warning"
-            android:summary="@string/operator_warning"
-            android:selectable="false" />
-
-        <Preference
             android:key="non_carrier_data_usage_warning"
             android:summary="@string/non_carrier_data_usage_warning"
             android:selectable="false" />
diff --git a/src/com/android/settings/datausage/DataUsageList.java b/src/com/android/settings/datausage/DataUsageList.java
index dd8312c..ee2a1ad 100644
--- a/src/com/android/settings/datausage/DataUsageList.java
+++ b/src/com/android/settings/datausage/DataUsageList.java
@@ -159,11 +159,6 @@
         mChart = findPreference(KEY_CHART_DATA);
         mApps = findPreference(KEY_APPS_GROUP);
 
-        final Preference unnecessaryWarningPreference = findPreference("operator_warning");
-        if (unnecessaryWarningPreference != null) {
-            unnecessaryWarningPreference.setVisible(false);
-        }
-
         processArgument();
         updateSubscriptionInfoEntity();
         mDataStateListener = new MobileDataEnabledListener(activity, this);