Correct the usage of finalize in TracingControllerAndroid class.

content/public/android/javatests/src/org/chromium/content/browser/TracingControllerAndroidTest.java

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.content.browser;
 
 import static org.chromium.base.test.util.ScalableTimeout.scaleTimeout;
 
 import android.os.SystemClock;
 import android.test.suitebuilder.annotation.MediumTest;
@@ skipping 43 matching lines @@
         while (tracingController.isTracing()) {
             if (SystemClock.uptimeMillis() > startTime + TIMEOUT_MILLIS) {
                 fail("Timed out waiting for tracing to stop.");
             }
             Thread.sleep(1000);
         }
 
         // It says it stopped, so it should have written the output file.
         assertTrue(file.exists());
         assertTrue(file.delete());
+        tracingController.destroy();
     }
 }