include only stuff you need, part 1: ast.h, ast-value-factory.h.

src/parsing/parameter-initializer-rewriter.h

 // Copyright 2015 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_PARAMETER_EXPRESSION_REWRITER_H_
 #define V8_PARSING_PARAMETER_EXPRESSION_REWRITER_H_
 
-#include "src/ast/ast.h"
+#include "src/types.h"
 
 namespace v8 {
 namespace internal {
 
+class Expression;
+class Scope;
+
 // When an extra declaration scope needs to be inserted to account for
 // a sloppy eval in a default parameter or function body, the expressions
 // needs to be in that new inner scope which was added after initial
 // parsing.
 //
 // param_scope is the new inner scope, and its outer_scope() is assumed
 // to be the function scope which was used during the initial parse.
 void ReparentParameterExpressionScope(uintptr_t stack_limit, Expression* expr,
                                       Scope* param_scope);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_PARSING_PARAMETER_EXPRESSION_REWRITER_H_