Enable --harmony-trailing-commas

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 46475c7422cf1f9f277cf6e74ade1ea2a09f6f10..2970e8605f172cc2250ef0df364c864e488a2211 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -209,9 +209,7 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
   V(harmony_regexp_lookbehind, "harmony regexp lookbehind") \
   V(harmony_restrictive_generators,                         \
     "harmony restrictions on generator declarations")       \
-  V(harmony_tailcalls, "harmony tail calls")                \
-  V(harmony_trailing_commas,                                \

[adamk, 2017/01/14 00:57:13]

Rather than removing this, you should move it down to HARMONY_SHIPPING_BASE
below. This would have been clearer except that I deleted our last shipping flag
(--harmony-async-await) earlier this week.

The idea is that a flag moves from INPROGRESS -> STAGED -> SHIPPING, and then
once it's shipped in a stable Chrome it gets removed.

Once you're not deleting the flag, most of the changes in this CL go away.

-    "harmony trailing commas in function parameter lists")
+  V(harmony_tailcalls, "harmony tail calls")
 
 #ifdef V8_I18N_SUPPORT
 #define HARMONY_STAGED(V)                                          \