Revert of [strong] Object literals create strong objects

src/preparser.h

Index: src/preparser.h
diff --git a/src/preparser.h b/src/preparser.h
index f6418f23b0d19386f4aab448019d65b7cafedc40..aeef700bfe7593a8369b4c4b5f0350fa8dc5b707 100644
--- a/src/preparser.h
+++ b/src/preparser.h
@@ -1340,13 +1340,11 @@
   PreParserExpression NewRegExpLiteral(PreParserIdentifier js_pattern,
                                        PreParserIdentifier js_flags,
                                        int literal_index,
-                                       bool is_strong,
                                        int pos) {
     return PreParserExpression::Default();
   }
   PreParserExpression NewArrayLiteral(PreParserExpressionList values,
                                       int literal_index,
-                                      bool is_strong,
                                       int pos) {
     return PreParserExpression::Default();
   }
@@ -1367,7 +1365,6 @@
                                        int literal_index,
                                        int boilerplate_properties,
                                        bool has_function,
-                                       bool is_strong,
                                        int pos) {
     return PreParserExpression::Default();
   }
@@ -2213,8 +2210,7 @@
   }
   IdentifierT js_flags = this->GetNextSymbol(scanner());
   Next();
-  return factory()->NewRegExpLiteral(js_pattern, js_flags, literal_index,
-                                     is_strong(language_mode()), pos);
+  return factory()->NewRegExpLiteral(js_pattern, js_flags, literal_index, pos);
 }
 
 
@@ -2479,8 +2475,7 @@
   // Update the scope information before the pre-parsing bailout.
   int literal_index = function_state_->NextMaterializedLiteralIndex();
 
-  return factory()->NewArrayLiteral(values, literal_index,
-                                    is_strong(language_mode()), pos);
+  return factory()->NewArrayLiteral(values, literal_index, pos);
 }
 
 
@@ -2736,7 +2731,6 @@
                                      literal_index,
                                      number_of_boilerplate_properties,
                                      has_function,
-                                     is_strong(language_mode()),
                                      pos);
 }