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No behaviour change intended. Using JavaRef instead of bare jobject
pointers is preferred. These changes are to prepare for an upcoming
refactoring.

Bug: 519562
Change-Id: Iff019df737a9d3f4edae0f5ede8c068cee3443d0
Reviewed-on: https://chromium-review.googlesource.com/c/1255662
Commit-Queue: Richard Coles <torne@chromium.org>
Reviewed-by: Shimi Zhang <ctzsm@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Paul Jensen <pauljensen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595922}