Remove inclusion of 'include/dart_api.h' in 'raw_object.h'

runtime/vm/dart_api_impl.h

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_DART_API_IMPL_H_
 #define VM_DART_API_IMPL_H_
 
 #include "vm/allocation.h"
 #include "vm/object.h"
 
@@ skipping 131 matching lines @@
 
   // Gets a handle to False
   static Dart_Handle False(Isolate* isolate);
 
   // Retrieves the top ApiLocalScope.
   static ApiLocalScope* TopScope(Isolate* isolate);
 
   // Performs one-time initialization needed by the API.
   static void InitOnce();
 
+  // Helper function to get the peer value of an external string object.
+  static bool ExternalStringGetPeerHelper(Dart_Handle object, void** peer);
+
  private:
   // Thread local key used by the API. Currently holds the current
   // ApiNativeScope if any.
   static ThreadLocalKey api_native_key_;
 
   friend class ApiNativeScope;
 };
 
 class IsolateSaver {
  public:
   explicit IsolateSaver(Isolate* current_isolate)
       : saved_isolate_(current_isolate) {
   }
   ~IsolateSaver() {
     Isolate::SetCurrent(saved_isolate_);
   }
  private:
   Isolate* saved_isolate_;
 
   DISALLOW_COPY_AND_ASSIGN(IsolateSaver);
 };
 
 }  // namespace dart.
 
 #endif  // VM_DART_API_IMPL_H_