Ship arrow functions

R=rossberg@chromium.org
LOG=Y
BUG=v8:2700

Review URL: https://codereview.chromium.org/1194873002

Cr-Commit-Position: refs/heads/master@{#29167}

src/flag-definitions.h

@@ -199,7 +199,6 @@ DEFINE_IMPLICATION(es_staging, harmony)
 // Features that are complete (but still behind --harmony/es-staging flag).
 #define HARMONY_STAGED(V)                                      \
   V(harmony_arrays, "harmony array methods")                   \
-  V(harmony_arrow_functions, "harmony arrow functions")        \
   V(harmony_rest_parameters, "harmony rest parameters")        \
   V(harmony_spreadcalls, "harmony spread-calls")               \
   V(harmony_spread_arrays, "harmony spread in array literals") \
@@ -207,6 +206,7 @@ DEFINE_IMPLICATION(es_staging, harmony)
 
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                                \
+  V(harmony_arrow_functions, "harmony arrow functions")                    \
   V(harmony_classes, "harmony classes (implies object literal extension)") \
   V(harmony_computed_property_names, "harmony computed property names")    \
   V(harmony_object_literals, "harmony object literal extensions")          \