Remove always-true --harmony-symbol-description runtime flag

It shipped in Chrome 70.

Bug: v8:7807, v8:8562
Change-Id: I5c5a9fc23656018ee6e9115af7a0c779230e681b
Reviewed-on: https://chromium-review.googlesource.com/c/1450787
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59589}

src/bootstrapper.cc

@@ -2159,6 +2159,11 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
                                  Builtins::kSymbolPrototypeValueOf, 0, true,
                                  BuiltinFunctionId::kSymbolPrototypeValueOf);
 
+    // Install the Symbol.prototype.description getter.
+    SimpleInstallGetter(isolate_, prototype,
+                        factory->InternalizeUtf8String("description"),
+                        Builtins::kSymbolPrototypeDescriptionGetter, true);
+
     // Install the @@toPrimitive function.
     InstallFunctionAtSymbol(
         isolate_, prototype, factory->to_primitive_symbol(),
@@ -4248,18 +4253,6 @@ void Genesis::InitializeGlobal_harmony_sharedarraybuffer() {
   InstallToStringTag(isolate_, isolate()->atomics_object(), "Atomics");
 }
 
-void Genesis::InitializeGlobal_harmony_symbol_description() {
-  if (!FLAG_harmony_symbol_description) return;
-
-  // Symbol.prototype.description
-  Handle<JSFunction> symbol_fun(native_context()->symbol_function(), isolate());
-  Handle<JSObject> symbol_prototype(
-      JSObject::cast(symbol_fun->instance_prototype()), isolate());
-  SimpleInstallGetter(isolate(), symbol_prototype,
-                      factory()->InternalizeUtf8String("description"),
-                      Builtins::kSymbolPrototypeDescriptionGetter, true);
-}
-
 void Genesis::InitializeGlobal_harmony_string_matchall() {
   if (!FLAG_harmony_string_matchall) return;
 

src/builtins/builtins-symbol-gen.cc

@@ -10,8 +10,8 @@ namespace v8 {
 namespace internal {
 
 // -----------------------------------------------------------------------------
-// ES6 #sec-symbol-objects
-// ES ##sec-symbol.prototype.description
+// ES #sec-symbol-objects
+// ES #sec-symbol.prototype.description
 TF_BUILTIN(SymbolPrototypeDescriptionGetter, CodeStubAssembler) {
   Node* context = Parameter(Descriptor::kContext);
   Node* receiver = Parameter(Descriptor::kReceiver);

src/flag-definitions.h

@@ -234,7 +234,6 @@ DEFINE_IMPLICATION(harmony_private_methods, harmony_private_fields)
   V(harmony_sharedarraybuffer, "harmony sharedarraybuffer")                    \
   V(harmony_import_meta, "harmony import.meta property")                       \
   V(harmony_dynamic_import, "harmony dynamic import")                          \
-  V(harmony_symbol_description, "harmony Symbol.prototype.description")        \
   V(harmony_global, "harmony global")                                          \
   V(harmony_json_stringify, "well-formed JSON.stringify")                      \
   V(harmony_public_fields, "harmony public instance fields in class literals") \

test/mjsunit/harmony/symbol-description.js

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --harmony-symbol-description
-
 {
   let desc = Object.getOwnPropertyDescriptor(Symbol.prototype, 'description');
   assertEquals(desc.set, undefined);

test/mkgrokdump/mkgrokdump.cc

@@ -16,7 +16,7 @@
 namespace v8 {
 
 static const char* kHeader =
-    "# Copyright 2018 the V8 project authors. All rights reserved.\n"
+    "# Copyright 2019 the V8 project authors. All rights reserved.\n"
     "# Use of this source code is governed by a BSD-style license that can\n"
     "# be found in the LICENSE file.\n"
     "\n"

tools/v8heapconst.py

-# Copyright 2018 the V8 project authors. All rights reserved.
+# Copyright 2019 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.