Refactoring of AudioTrackJni and AudioRecordJni using new JVM/JNI classes

BUG=NONE
TEST=./webrtc/build/android/test_runner.py gtest -s modules_unittests --gtest_filter=AudioDevice*
R=tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/51079004

Cr-Commit-Position: refs/heads/master@{#9271}
13 files changed