Android: Update convenience macro defining JNI-accessible methods

Update the name of the macro to something more descriptive and use
variable length arguments to make it work better with autoformatting
tools.

BUG=None

Review-Url: https://codereview.webrtc.org/2998403002
Cr-Original-Commit-Position: refs/heads/master@{#19538}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 09f3f6eb268b7d84cc8aa2e36a84cf6380f74037
22 files changed