Disable tracing if enabled by default for new tracing test.

Bug: 17412385
Change-Id: If963a9ba2214c72efbef673a840bbeb6fdbb1795
diff --git a/test/099-vmdebug/src/Main.java b/test/099-vmdebug/src/Main.java
index d51ec6e..e2c04db 100644
--- a/test/099-vmdebug/src/Main.java
+++ b/test/099-vmdebug/src/Main.java
@@ -41,6 +41,10 @@
         File tempFile = new File(tempFileName);
         tempFile.delete();
 
+        if (VMDebug.getMethodTracingMode() != 0) {
+            VMDebug.stopMethodTracing();
+        }
+
         System.out.println("Confirm enable/disable");
         System.out.println("status=" + VMDebug.getMethodTracingMode());
         VMDebug.startMethodTracing(tempFileName, 0, 0, false, 0);