Revert of [esnext] ship String.prototype.padStart / String.prototype.padEnd

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 2d105173016424da1425e3a59d2a82d43b48a341..f906aa9b180aa151d671deabf9a5bfb8be279e39 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -209,9 +209,10 @@
   V(harmony_class_fields, "harmony public fields in class literals")
 
 // Features that are complete (but still behind --harmony/es-staging flag).
-#define HARMONY_STAGED_BASE(V)                              \
-  V(harmony_regexp_lookbehind, "harmony regexp lookbehind") \
-  V(harmony_tailcalls, "harmony tail calls")
+#define HARMONY_STAGED_BASE(V)                                               \
+  V(harmony_regexp_lookbehind, "harmony regexp lookbehind")                  \
+  V(harmony_tailcalls, "harmony tail calls")                                 \
+  V(harmony_string_padding, "harmony String-padding methods")
 
 #ifdef V8_I18N_SUPPORT
 #define HARMONY_STAGED(V)                                          \
@@ -229,8 +230,7 @@
     "harmony limitations on sloppy mode function declarations")              \
   V(harmony_object_values_entries, "harmony Object.values / Object.entries") \
   V(harmony_object_own_property_descriptors,                                 \
-    "harmony Object.getOwnPropertyDescriptors()")                            \
-  V(harmony_string_padding, "harmony String-padding methods")
+    "harmony Object.getOwnPropertyDescriptors()")
 
 // 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,