RESTRICT AUTOMERGE Close TextClassifier native resources.
Bug:
122904322
Test: atest android.view.textclassifier.TextClassificationManagerTest
Test: (MANUAL)
1. Start an app with a TextView
2. Select the text to trigger the text selection toolbar and TextClassifier
3. Close the app's activity by repeatedly clicking back on the nav bar
4. Start a Profiler for the app and observe for memory growth
5. Repeat 1 - 3 several times and observe.
If the bug still exists, memory should grow at about 4 - 5MB.
If the bug is fixed, Memory should remain about the same across activity restarts.
Change-Id: Id9a60dea85cf3949de030042537287ddb29842a2