Remove duplicate isDragResizible method

Test: Current tests pass
Bug: 368055148
Flag: EXEMPT refactoring
Change-Id: I64913472613ce452e52cd34a681c2ac7a84fabf7
diff --git a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecoration.java b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecoration.java
index bcad4633..b63f82b 100644
--- a/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecoration.java
+++ b/libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecoration.java
@@ -576,10 +576,6 @@
         mWindowDecorCaptionHandleRepository.notifyCaptionChanged(captionState);
     }
 
-    private static boolean isDragResizable(ActivityManager.RunningTaskInfo taskInfo) {
-        return taskInfo.isFreeform() && taskInfo.isResizeable;
-    }
-
     private void updateMaximizeMenu(SurfaceControl.Transaction startT) {
         if (!isDragResizable(mTaskInfo) || !isMaximizeMenuActive()) {
             return;