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Using relative paths was causing build failures. To create this change:
  * find out/Debug -name *_jni.h -delete
  * find . -name BUILD.gn -exec sed -i '/jni_package =/d' {} \;
  * ninja $CHROMECAST_JNI_HEADERS
  * refactor_jni_includes.py  --out-dir out/Debug --repl-dir chromecast
  * fix DEPs files manually

See https://groups.google.com/a/chromium.org/forum/?#!topic/java/MEovGrAwbqI
for discussion on naming scheme.

Bug: 964169
Change-Id: I8aa1c635183444363f6a485464c3953331036e13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1672195
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671682}