Remove the redundant `getExpansionFraction()` method from `NotificationPanelViewController`.

Bug: 254245550.
Test: Manually tested on a device.
Change-Id: I6e5cf7c433d6dc1eaa5864401b71bd82ce955c73
diff --git a/packages/SystemUI/src/com/android/systemui/shade/NotificationPanelViewController.java b/packages/SystemUI/src/com/android/systemui/shade/NotificationPanelViewController.java
index 8f512d0..dede275 100644
--- a/packages/SystemUI/src/com/android/systemui/shade/NotificationPanelViewController.java
+++ b/packages/SystemUI/src/com/android/systemui/shade/NotificationPanelViewController.java
@@ -704,7 +704,7 @@
         updatePanelExpansionAndVisibility();
     };
     private final Runnable mMaybeHideExpandedRunnable = () -> {
-        if (getExpansionFraction() == 0.0f) {
+        if (getExpandedFraction() == 0.0f) {
             postToView(mHideExpandedRunnable);
         }
     };
@@ -5370,10 +5370,6 @@
                 InteractionJankMonitor.CUJ_NOTIFICATION_SHADE_EXPAND_COLLAPSE);
     }
 
-    private float getExpansionFraction() {
-        return mExpandedFraction;
-    }
-
     private ShadeExpansionStateManager getShadeExpansionStateManager() {
         return mShadeExpansionStateManager;
     }