When --harmony-strict-legacy-accessor-builtins is enabled, it brings
V8's behavior in line with the spec and more recent versions of
SpiderMonkey and JSC:
  - No implicit receiver coercion
  - Attempting to redefine a non-configurable property throws

Bug: v8:5070
Change-Id: I82b927538604136c0c550e19bcc606fbfea1377e
Reviewed-on: https://chromium-review.googlesource.com/478312Reviewed-by: Daniel Ehrenberg <littledan@chromium.org>
Commit-Queue: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44703}