Fix crash that isInMultiWindownMode is not supported on M.

Bug: 68143529
Test: none
PiperOrigin-RevId: 173439449
Change-Id: I80ebb4e8b17551144e492424e7aa6d92f26cc576
diff --git a/java/com/android/incallui/InCallActivityCommon.java b/java/com/android/incallui/InCallActivityCommon.java
index d39ce22..a9702b4 100644
--- a/java/com/android/incallui/InCallActivityCommon.java
+++ b/java/com/android/incallui/InCallActivityCommon.java
@@ -51,6 +51,7 @@
 import com.android.dialer.animation.AnimUtils;
 import com.android.dialer.animation.AnimationListenerAdapter;
 import com.android.dialer.common.LogUtil;
+import com.android.dialer.compat.ActivityCompat;
 import com.android.dialer.compat.CompatUtils;
 import com.android.dialer.logging.Logger;
 import com.android.dialer.logging.ScreenEvent;
@@ -714,7 +715,7 @@
   }
 
   void updateNavigationBar(boolean isDialpadVisible) {
-    if (!inCallActivity.isInMultiWindowMode()) {
+    if (!ActivityCompat.isInMultiWindowMode(inCallActivity)) {
       View navigationBarBackground =
           inCallActivity.getWindow().findViewById(R.id.navigation_bar_background);
       if (navigationBarBackground != null) {