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Rather than generating a different ${Foo}Jni class for every
target when use_hashed_jni_names=true, also have classes use
org.chromium.base.natives.GEN_JNI.

Then, at the final step, have GEN_JNI forward calls to J.N.$HASH.

Makes a bit more work for R8 (it needs to inline all the GEN_JNI
methods), but move the "hashed functions" logic to live in
one spot at the end of the pipeline.

A byproduct of this is that toggling use_hashed_jni_names no
long requires all libraries to be recompiled (attached bug)

Bug: 1073921
Change-Id: I8df7c751b51d60e878f270c06e2e979dd9dbc821
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2162109Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762036}