Remove unused native implementation of Object.wait()

As part of the process of verifying Java files against 8u121-b13 the
Object.wait() method has been changed from a native method to a pure
Java implementation. This removes the unused native implementation
method and the supporting method in mirror::Object.

Updated the 911-get-stack-trace test to handle the two extra stack
elements added by this change.

Bug: 74379469
Test: make checkbuild, flash
Change-Id: Ifbc4612f7d949416d8c703628fa8cafaa296c350
diff --git a/test/911-get-stack-trace/src/art/OtherThread.java b/test/911-get-stack-trace/src/art/OtherThread.java
index 675bff5..3f5ae59 100644
--- a/test/911-get-stack-trace/src/art/OtherThread.java
+++ b/test/911-get-stack-trace/src/art/OtherThread.java
@@ -36,8 +36,8 @@
     System.out.println("From top");
     PrintThread.print(t, 0, 25);
     PrintThread.print(t, 1, 25);
-    PrintThread.print(t, 0, 5);
-    PrintThread.print(t, 2, 5);
+    PrintThread.print(t, 0, 7);
+    PrintThread.print(t, 2, 7);
 
     System.out.println("From bottom");
     PrintThread.print(t, -1, 25);