Move non-API code out of sync/api/attachments/

sync/internal_api/public/attachments/attachment_service_proxy.h

Index: sync/internal_api/public/attachments/attachment_service_proxy.h
diff --git a/sync/api/attachments/attachment_service_proxy.h b/sync/internal_api/public/attachments/attachment_service_proxy.h
similarity index 93%
rename from sync/api/attachments/attachment_service_proxy.h
rename to sync/internal_api/public/attachments/attachment_service_proxy.h
index 5f991e0f7af936fd6e3d6aa483a4e81fd59f16eb..fb7c08c92882059f183be6e9483770eb52947cdd 100644
--- a/sync/api/attachments/attachment_service_proxy.h
+++ b/sync/internal_api/public/attachments/attachment_service_proxy.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_H_
-#define SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_H_
+#ifndef SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_H_
+#define SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
@@ -12,13 +12,11 @@
 #include "base/sequenced_task_runner.h"
 #include "base/task_runner.h"
 #include "sync/api/attachments/attachment.h"
-#include "sync/api/attachments/attachment_service.h"
 #include "sync/base/sync_export.h"
+#include "sync/internal_api/public/attachments/attachment_service.h"
 
 namespace syncer {
 
-class SyncData;
-
 // AttachmentServiceProxy wraps an AttachmentService allowing multiple threads
 // to share the wrapped AttachmentService and invoke its methods in the
 // appropriate thread.
@@ -112,4 +110,4 @@ class SYNC_EXPORT AttachmentServiceProxy : public AttachmentService {
 
 }  // namespace syncer
 
-#endif  // SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_H_
+#endif  // SYNC_INTERNAL_API_PUBLIC_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_H_