Remove dead GYP target audio_device_module_java

This is no longer referenced after
https://codereview.webrtc.org/1439593002 was submitted.

NOTRY=True

Review-Url: https://codereview.webrtc.org/2080163002
Cr-Original-Commit-Position: refs/heads/master@{#13209}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 02343b9ae22c02b5a1e7b93230f6b46f5a8b1dfc
3 files changed