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Previously, moving Java files used by JNI to new locations could cause
build failures. This CL addressed stale generated files by deleting
stale files from the output directory before creating new ones.

Also merge the two generate_jni() templates since they're pretty much
the same.

Bug: 951701
Change-Id: Id066d8e74a52ed0c4c6fd29e92108c2e0bbfe96b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610749
Commit-Queue: Eric Stevenson <estevenson@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660651}