Clean up VisibilityLogging

Remove unused methods

Bug: 119780708
Test: rebuild
Change-Id: Iaa1aa0f627de48703f1b349e2459312984b08a96
diff --git a/packages/SettingsLib/src/com/android/settingslib/core/instrumentation/VisibilityLoggerMixin.java b/packages/SettingsLib/src/com/android/settingslib/core/instrumentation/VisibilityLoggerMixin.java
index aed02a2..8090169 100644
--- a/packages/SettingsLib/src/com/android/settingslib/core/instrumentation/VisibilityLoggerMixin.java
+++ b/packages/SettingsLib/src/com/android/settingslib/core/instrumentation/VisibilityLoggerMixin.java
@@ -41,10 +41,6 @@
     private int mSourceMetricsCategory = MetricsProto.MetricsEvent.VIEW_UNKNOWN;
     private long mVisibleTimestamp;
 
-    private VisibilityLoggerMixin() {
-        mMetricsCategory = METRICS_CATEGORY_UNKNOWN;
-    }
-
     public VisibilityLoggerMixin(int metricsCategory, MetricsFeatureProvider metricsFeature) {
         mMetricsCategory = metricsCategory;
         mMetricsFeature = metricsFeature;
@@ -81,12 +77,4 @@
                 MetricsFeatureProvider.EXTRA_SOURCE_METRICS_CATEGORY,
                 MetricsProto.MetricsEvent.VIEW_UNKNOWN);
     }
-
-    /** Returns elapsed time since onResume() */
-    public long elapsedTimeSinceVisible() {
-        if (mVisibleTimestamp == 0) {
-            return 0;
-        }
-        return SystemClock.elapsedRealtime() - mVisibleTimestamp;
-    }
 }