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This eliminates calls to AXAuraObjCache::GetInstance() and is a step
towards making the cache not be a singleton.

Bug: 888147
Test: views_unittests
Change-Id: I94dee9693881ff760be1c32b084072379e5d803b
Reviewed-on: https://chromium-review.googlesource.com/c/1359093
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614740}