Disable --harmony-object-observe

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 176 matching lines @@
 
 DEFINE_BOOL(legacy_const, true, "legacy semantics for const in sloppy mode")
 // ES2015 const semantics are staged
 DEFINE_NEG_IMPLICATION(harmony, legacy_const)
 
 // Activate on ClusterFuzz.
 DEFINE_IMPLICATION(es_staging, harmony_destructuring_bind)
 
 // Features that are still work in progress (behind individual flags).
 #define HARMONY_INPROGRESS(V)                                         \
+  V(harmony_object_observe, "harmony Object.observe")                 \
   V(harmony_modules, "harmony modules")                               \
   V(harmony_proxies, "harmony proxies")                               \
   V(harmony_unicode_regexps, "harmony unicode regexps")               \
   V(harmony_reflect, "harmony Reflect API")                           \
   V(harmony_sloppy_function, "harmony sloppy function block scoping") \
   V(harmony_sharedarraybuffer, "harmony sharedarraybuffer")           \
   V(harmony_simd, "harmony simd")                                     \
   V(harmony_do_expressions, "harmony do-expressions")                 \
   V(harmony_regexp_subclass, "harmony regexp subclassing")            \
   V(harmony_regexp_lookbehind, "harmony regexp lookbehind")           \
   V(harmony_destructuring_assignment, "harmony destructuring assignment")
 
 // Features that are complete (but still behind --harmony/es-staging flag).
 #define HARMONY_STAGED(V)                                     \
   V(harmony_regexps, "harmony regular expression extensions") \
   V(harmony_sloppy, "harmony features in sloppy mode")        \
   V(harmony_sloppy_let, "harmony let in sloppy mode")
 
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                     \
   V(harmony_array_includes, "harmony Array.prototype.includes") \
   V(harmony_default_parameters, "harmony default parameters")   \
   V(harmony_destructuring_bind, "harmony destructuring bind")   \
-  V(harmony_object_observe, "harmony Object.observe")           \
   V(harmony_rest_parameters, "harmony rest parameters")         \
   V(harmony_concat_spreadable, "harmony isConcatSpreadable")    \
   V(harmony_tolength, "harmony ToLength")                       \
   V(harmony_tostring, "harmony toString")                       \
   V(harmony_completion, "harmony completion value semantics")
 
 // 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.
@@ skipping 893 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