drive: Stop using callback for ResourceMetadataStorage::Iterate

chrome/browser/chromeos/drive/resource_metadata.h

 // Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_DRIVE_RESOURCE_METADATA_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_RESOURCE_METADATA_H_
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time.h"
 #include "chrome/browser/chromeos/drive/file_errors.h"
-#include "chrome/browser/chromeos/drive/resource_metadata_storage.h"
 
 namespace base {
 class SequencedTaskRunner;
 }
 
 namespace drive {
 
 class ResourceEntry;
 class ResourceMetadataStorage;
 
@@ skipping 80 matching lines @@
   ~EntryInfoPairResult();
 
   EntryInfoResult first;
   EntryInfoResult second;  // Only filled if the first entry is found.
 };
 
 // Used to receive the result from GetEntryInfoPairCallback().
 typedef base::Callback<void(scoped_ptr<EntryInfoPairResult> pair_result)>
     GetEntryInfoPairCallback;
 
+typedef base::Callback<void(const ResourceEntry& entry)> IterateCallback;
+
 namespace internal {
 
 // Storage for Drive Metadata.
 // All methods must be run with |blocking_task_runner| unless otherwise noted.
 class ResourceMetadata {
  public:
   // |root_resource_id| is the resource id for the root directory.
   // Must be called on the UI thread.
   ResourceMetadata(
       const base::FilePath& data_directory_path,
@@ skipping 240 matching lines @@
   // invalidate its weak pointers before other members are destroyed.
   base::WeakPtrFactory<ResourceMetadata> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceMetadata);
 };
 
 }  // namespace internal
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_RESOURCE_METADATA_H_