Remove destructuring and default arguments runtime flags

src/parsing/preparser.cc

 // Copyright 2011 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.
 
 #include <cmath>
 
 #include "src/allocation.h"
 #include "src/base/logging.h"
 #include "src/conversions-inl.h"
 #include "src/conversions.h"
@@ skipping 503 matching lines @@
   // block.
   int nvars = 0;  // the number of variables declared
   int bindings_start = peek_position();
   do {
     // Parse binding pattern.
     if (nvars > 0) Consume(Token::COMMA);
     int decl_pos = peek_position();
     PreParserExpression pattern = PreParserExpression::Default();
     {
       ExpressionClassifier pattern_classifier(this);
-      Token::Value next = peek();
       pattern = ParsePrimaryExpression(&pattern_classifier, CHECK_OK);
 
       ValidateBindingPattern(&pattern_classifier, CHECK_OK);
       if (lexical) {
         ValidateLetPattern(&pattern_classifier, CHECK_OK);
       }
-
-      if (!allow_harmony_destructuring_bind() && !pattern.IsIdentifier()) {
-        ReportUnexpectedToken(next);
-        *ok = false;
-        return Statement::Default();
-      }
     }
 
     is_pattern = pattern.IsObjectLiteral() || pattern.IsArrayLiteral();
 
     Scanner::Location variable_loc = scanner()->location();
     nvars++;
     if (Check(Token::ASSIGN)) {
       ExpressionClassifier classifier(this);
       ParseAssignmentExpression(var_context != kForStatement, &classifier,
                                 CHECK_OK);
@@ skipping 301 matching lines @@
     } else {
       int lhs_beg_pos = peek_position();
       ExpressionClassifier classifier(this);
       Expression lhs = ParseExpression(false, &classifier, CHECK_OK);
       int lhs_end_pos = scanner()->location().end_pos;
       is_let_identifier_expression =
           lhs.IsIdentifier() && lhs.AsIdentifier().IsLet();
       bool is_for_each = CheckInOrOf(&mode, ok);
       if (!*ok) return Statement::Default();
       bool is_destructuring = is_for_each &&
-                              allow_harmony_destructuring_assignment() &&
                               (lhs->IsArrayLiteral() || lhs->IsObjectLiteral());
 
       if (is_destructuring) {
         ValidateAssignmentPattern(&classifier, CHECK_OK);
       } else {
         ValidateExpression(&classifier, CHECK_OK);
       }
 
       if (is_for_each) {
         if (!is_destructuring) {
@@ skipping 295 matching lines @@
     Expect(Token::RBRACE, CHECK_OK);
     return PreParserExpression::Default();
   }
 }
 
 #undef CHECK_OK
 
 
 }  // namespace internal
 }  // namespace v8