- proxies-with-unscopables needed updating of trap names
- proxies-symbols doesn't make sense any more: it tested symbol fitering/
  blacklisting, but Proxies interact with Symbols just fine according to
  the current spec.

BUG=v8:1543
LOG=n

Review URL: https://codereview.chromium.org/1529473002

Cr-Commit-Position: refs/heads/master@{#32844}