PreParsing inner funcs: Remove nonsense code from PreParser.

src/parsing/preparser.h

 // Copyright 2012 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.
 
 #ifndef V8_PARSING_PREPARSER_H
 #define V8_PARSING_PREPARSER_H
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/parsing/parser-base.h"
@@ skipping 138 matching lines @@
     expression.AddVariable(variable, zone);
     return expression;
   }
 
   static PreParserExpression BinaryOperation(PreParserExpression left,
                                              Token::Value op,
                                              PreParserExpression right) {
     return PreParserExpression(TypeField::encode(kExpression));
   }
 
-  static PreParserExpression Assignment(ZoneList<VariableProxy*>* variables) {
+  static PreParserExpression Assignment() {
     return PreParserExpression(TypeField::encode(kExpression) |
-                                   ExpressionTypeField::encode(kAssignment),
-                               variables);
+                               ExpressionTypeField::encode(kAssignment));
   }
 
   static PreParserExpression ObjectLiteral(
       ZoneList<VariableProxy*>* variables) {
     return PreParserExpression(TypeField::encode(kObjectLiteralExpression),
                                variables);
   }
 
   static PreParserExpression ArrayLiteral(ZoneList<VariableProxy*>* variables) {
     return PreParserExpression(TypeField::encode(kArrayLiteralExpression),
@@ skipping 438 matching lines @@
                                           PreParserExpression right, int pos) {
     return PreParserExpression::Default();
   }
   PreParserExpression NewRewritableExpression(PreParserExpression expression) {
     return expression;
   }
   PreParserExpression NewAssignment(Token::Value op,
                                     PreParserExpression left,
                                     PreParserExpression right,
                                     int pos) {
-    // For tracking variables for parameters with a default value.
-    return PreParserExpression::Assignment(left.variables_);
+    return PreParserExpression::Assignment();
   }
   PreParserExpression NewYield(PreParserExpression generator_object,
                                PreParserExpression expression, int pos,
                                Yield::OnException on_exception) {
     return PreParserExpression::Default();
   }
   PreParserExpression NewConditional(PreParserExpression condition,
                                      PreParserExpression then_expression,
                                      PreParserExpression else_expression,
                                      int pos) {
@@ skipping 965 matching lines @@
     function_state_->NextMaterializedLiteralIndex();
     function_state_->NextMaterializedLiteralIndex();
   }
   return EmptyExpression();
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PREPARSER_H