Revert "Android: Switch cast_shell to use implicit JNI registration"

This reverts commit f1854090df71901e50c22e793daa0ffc91b6ae6e.

Reason for revert: Causes internal b/120143260.

Change-Id: I83286ee7cb9d5e96e63be66bc47efda802421232
Reviewed-on: https://chromium-review.googlesource.com/c/1354326
Commit-Queue: Alex Leung <alexleung@google.com>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612333}
3 files changed