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

sync/api/attachments/attachment_service_proxy_for_test.h

-// Copyright 2014 The Chromium 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 SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_FOR_TEST_H_
-#define SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_FOR_TEST_H_
-
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/weak_ptr.h"
-#include "sync/api/attachments/attachment_service_proxy.h"
-#include "sync/base/sync_export.h"
-
-namespace syncer {
-
-// An self-contained AttachmentServiceProxy to reduce boilerplate code in tests.
-//
-// Constructs and owns an AttachmentService suitable for use in tests.
-// NOTE: This class does not require the current thread to have a MessageLoop,
-// however all methods will effectively become no-op stubs in that case.
-class SYNC_EXPORT AttachmentServiceProxyForTest
-    : public AttachmentServiceProxy {
- public:
-  static AttachmentServiceProxy Create();
-  virtual ~AttachmentServiceProxyForTest();
-
- private:
-  // A Core that owns the wrapped AttachmentService.
-  class OwningCore : public AttachmentServiceProxy::Core {
-   public:
-    OwningCore(
-        scoped_ptr<AttachmentService>,
-        scoped_ptr<base::WeakPtrFactory<AttachmentService> > weak_ptr_factory);
-
-   private:
-    scoped_ptr<AttachmentService> wrapped_;
-    // WeakPtrFactory for wrapped_.  See Create() for why this is a scoped_ptr.
-    scoped_ptr<base::WeakPtrFactory<AttachmentService> > weak_ptr_factory_;
-
-    virtual ~OwningCore();
-
-    DISALLOW_COPY_AND_ASSIGN(OwningCore);
-  };
-
-  AttachmentServiceProxyForTest(
-      const scoped_refptr<base::SequencedTaskRunner>& wrapped_task_runner,
-      const scoped_refptr<Core>& core);
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_API_ATTACHMENTS_ATTACHMENT_SERVICE_PROXY_FOR_TEST_H_