[builtins] Migrate Object.keys to C++.
Everything necessary to implement Object.keys efficiently is already available in C++ land for quite some time now, and only the thin JavaScript wrapper was left, so get rid of that as well and move the whole builtin to C++ instead. R=yangguo@chromium.org Review URL: https://codereview.chromium.org/1567963002 Cr-Commit-Position: refs/heads/master@{#33167}
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