gdata: Make GDataDirectory::FindChild() private

chrome/browser/chromeos/gdata/gdata_files.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_GDATA_GDATA_FILES_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILES_H_
 
 #include <map>
 #include <string>
 
@@ skipping 272 matching lines @@
 
   // Takes the ownership of |entry| from its current parent. If this directory
   // is already the current parent of |file|, this method effectively goes
   // through the name de-duplication for |file| based on the current state of
   // the file system.
   bool TakeEntry(GDataEntry* entry);
 
   // Takes over all entries from |dir|.
   bool TakeOverEntries(GDataDirectory* dir);
 
-  // Find a child by its name.
-  GDataEntry* FindChild(const FilePath::StringType& file_name) const;
-
   // Removes the entry from its children list and destroys the entry instance.
   bool RemoveEntry(GDataEntry* entry);
 
   // Removes child elements.
   void RemoveChildren();
   void RemoveChildFiles();
   void RemoveChildDirectories();
 
   // Collection of children files/directories.
   const GDataFileCollection& child_files() const { return child_files_; }
   const GDataDirectoryCollection& child_directories() const {
     return child_directories_;
   }
 
  private:
+  friend class GDataDirectoryService;
+
+  // Find a child by its name.
+  // TODO(satorux): Remove this. crbug.com/139649
+  GDataEntry* FindChild(const FilePath::StringType& file_name) const;
+
   // Add |entry| to children.
   void AddChild(GDataEntry* entry);
 
   // Removes the entry from its children without destroying the
   // entry instance.
   bool RemoveChild(GDataEntry* entry);
 
   // Collection of children GDataEntry items.
   GDataFileCollection child_files_;
   GDataDirectoryCollection child_directories_;
@@ skipping 66 matching lines @@
   size_t serialized_size_;
   int largest_changestamp_;  // Stored in the serialized proto.
   ContentOrigin origin_;
 
   DISALLOW_COPY_AND_ASSIGN(GDataDirectoryService);
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILES_H_