includes: Make ast.h not need isolate.h any more.

src/ast/modules.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_AST_MODULES_H_
 #define V8_AST_MODULES_H_
 
 #include "src/parsing/scanner.h"  // Only for Scanner::Location.
-#include "src/pending-compilation-error-handler.h"
 #include "src/zone-containers.h"
 
 namespace v8 {
 namespace internal {
 
-
 class AstRawString;
-
+class PendingCompilationErrorHandler;
 
 class ModuleDescriptor : public ZoneObject {
  public:
   explicit ModuleDescriptor(Zone* zone)
       : special_exports_(1, zone),
         special_imports_(1, zone),
         regular_exports_(zone),
         regular_imports_(zone) {}
 
   // The following Add* methods are high-level convenience functions for use by
@@ skipping 139 matching lines @@
   // into:
   //   import {a as b} from "X"; export {a as c} from "X";
   // (The import entry is never deleted.)
   void MakeIndirectExportsExplicit(Zone* zone);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_AST_MODULES_H_