gdata: Make GDataDirectory::FindChild() private

chrome/browser/chromeos/gdata/gdata_files.h

Index: chrome/browser/chromeos/gdata/gdata_files.h
diff --git a/chrome/browser/chromeos/gdata/gdata_files.h b/chrome/browser/chromeos/gdata/gdata_files.h
index cc0ed9ed3b3838d4ef15ed6cfc4b404c949af7c2..78ef14ccd78cd5e082dcf8c7ca841fb079d3bf0d 100644
--- a/chrome/browser/chromeos/gdata/gdata_files.h
+++ b/chrome/browser/chromeos/gdata/gdata_files.h
@@ -290,9 +290,6 @@ class GDataDirectory : public GDataEntry {
   // 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);
 
@@ -308,6 +305,12 @@ class GDataDirectory : public GDataEntry {
   }
 
  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);