Unship harmony tostring

Blink's DOM bindings are not yet ready.

BUG=493137, 239915
LOG=N
R=rossberg, adamk
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1153263004

Cr-Commit-Position: refs/heads/master@{#28804}

src/flag-definitions.h

@@ -201,14 +201,15 @@ DEFINE_IMPLICATION(es_staging, harmony)
   V(harmony_rest_parameters, "harmony rest parameters")        \
   V(harmony_spreadcalls, "harmony spread-calls")               \
   V(harmony_object, "harmony Object methods")                  \
-  V(harmony_spread_arrays, "harmony spread in array literals")
+  V(harmony_spread_arrays, "harmony spread in array literals") \
+  V(harmony_tostring, "harmony toString")
+
 
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                                \
   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")          \
-  V(harmony_tostring, "harmony toString")                                  \
   V(harmony_unicode, "harmony unicode escapes")                            \
 
 // Once a shipping feature has proved stable in the wild, it will be dropped

test/mjsunit/es6/built-in-accessor-names.js

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// Flags: --harmony-tostring
+
 'use strict';
 
 function assertGetterName(expected, object, name) {

test/mjsunit/harmony/sharedarraybuffer.js

@@ -25,7 +25,8 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --harmony-sharedarraybuffer
+// Flags: --harmony-sharedarraybuffer --harmony-tostring
+
 
 // SharedArrayBuffer