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In crrev.com/659558, we removed a number of ifdef guards that appeared
to be redundant. Apparently they weren't. Replace what used to be
USE_DEFAULT_RENDER_THEME with USE_AURA (which was equivalent).

Bug: 963366
Change-Id: I1ffcd83e780a92529f5449a014fe7dc06f6fc07b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1612853Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660045}