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Two fixes:
1) Move static getters to a separate LibraryLoaderConfig.java
   * Required because of the non-trivial class initializer in
     LibraryLoader preventing inlining.
2) Change JNI proguard rules to not -keep natives when the linker
   is not used.

TBR=agrieve  # Renames

Change-Id: I0f4a40af6168cbe7243f462c24d230d277e642ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1703155
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692146}