Remove all harmony runtime flags which shipped in M51

src/flag-definitions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file defines all of the flags.  It is separated into different section,
 // for Debug, Release, Logging and Profiling, etc.  To add a new flag, find the
 // correct section, and use one of the DEFINE_ macros, without a trailing ';'.
 //
 // This include does not have a guard, because it is a template-style include,
 // which can be included multiple times in different modes.  It expects to have
@@ skipping 212 matching lines @@
 #ifdef V8_I18N_SUPPORT
 #define HARMONY_STAGED(V) \
   HARMONY_STAGED_BASE(V)  \
   V(icu_case_mapping, "case mapping with ICU rather than Unibrow")
 #else
 #define HARMONY_STAGED(V) HARMONY_STAGED_BASE(V)
 #endif
 
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                           \
-  V(harmony_function_name, "harmony Function name inference")         \
-  V(harmony_instanceof, "harmony instanceof support")                 \
-  V(harmony_iterator_close, "harmony iterator finalization")          \
-  V(harmony_unicode_regexps, "harmony unicode regexps")               \
-  V(harmony_regexp_exec, "harmony RegExp exec override behavior")     \
-  V(harmony_regexp_subclass, "harmony regexp subclassing")            \
   V(harmony_restrictive_declarations,                                 \
     "harmony limitations on sloppy mode function declarations")       \
-  V(harmony_species, "harmony Symbol.species")                        \
   V(harmony_exponentiation_operator, "harmony exponentiation operator `**`")
 
 // Once a shipping feature has proved stable in the wild, it will be dropped
 // from HARMONY_SHIPPING, all occurrences of the FLAG_ variable are removed,
 // and associated tests are moved from the harmony directory to the appropriate
 // esN directory.
 
 
 #define FLAG_INPROGRESS_FEATURES(id, description) \
   DEFINE_BOOL(id, false, "enable " #description " (in progress)")
@@ skipping 945 matching lines @@
 #undef DEFINE_ALIAS_FLOAT
 #undef DEFINE_ALIAS_ARGS
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META
 #undef FLAG_MODE_DEFINE_IMPLICATIONS
 
 #undef COMMA