Revert of [Proxies] Ship Proxies + Reflect (patchset #2 id:20001 of...

Revert of [Proxies] Ship Proxies + Reflect (patchset #2 id:20001 of https://codereview.chromium.org/1580693002/ )

Reason for revert:
[Sheriff] Breaks layout tests. Please fix upstream first.

https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2032/builds/3587
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/3873

Original issue's description:
> [Proxies] Ship Proxies + Reflect
>
> BUG=v8:3931,v8:1543
> LOG=Y
> R=verwaest@chromium.org, rossberg@chromium.org
>
> Committed: https://crrev.com/9ce5162fd2a36daf318e0ec3838cd90f4e179168
> Cr-Commit-Position: refs/heads/master@{#33234}

TBR=rossberg@chromium.org,verwaest@chromium.org,hablich@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:3931,v8:1543

Review URL: https://codereview.chromium.org/1579573004

Cr-Commit-Position: refs/heads/master@{#33236}

src/flag-definitions.h

@@ -210,6 +210,8 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
 
 // Features that are complete (but still behind --harmony/es-staging flag).
 #define HARMONY_STAGED(V)                                                 \
+  V(harmony_proxies, "harmony proxies")                                   \
+  V(harmony_reflect, "harmony Reflect API")                               \
   V(harmony_regexp_lookbehind, "harmony regexp lookbehind")
 
 // Features that are shipping (turned on by default, but internal flag remains).
@@ -225,9 +227,7 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
   V(harmony_regexps, "harmony regular expression extensions")             \
   V(harmony_sloppy, "harmony features in sloppy mode")                    \
   V(harmony_sloppy_let, "harmony let in sloppy mode")                     \
-  V(harmony_sloppy_function, "harmony sloppy function block scoping")     \
-  V(harmony_proxies, "harmony proxies")                                   \
-  V(harmony_reflect, "harmony Reflect API")
+  V(harmony_sloppy_function, "harmony sloppy function block scoping")
 
 
 // Once a shipping feature has proved stable in the wild, it will be dropped

test/mjsunit/mjsunit.status

@@ -1174,7 +1174,6 @@
   'regress/regress-copy-hole-to-field': [SKIP],
   'regress/regress-crbug-315252': [SKIP],
   'regress/regress-crbug-412215': [SKIP],
-  'regress/regress-crbug-513507': [SKIP],
   'regress/regress-deopt-store-effect': [SKIP],
   'regress/regress-undefined-store-keyed-fast-element': [SKIP],
   'regress/typed-array-lifetime': [SKIP],