gdata: Make callback parameters mandatory for CloseFile functions

chrome/browser/chromeos/gdata/gdata_file_system.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_FILE_SYSTEM_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 254 matching lines @@
                           const FilePath& cache_file_path);
 
   // Invoked during the process of CloseFile. What is done here is as follows:
   // 1) Gets resource_id and md5 of the entry at |file_path|.
   // 2) Gets the local path of the cache file from resource_id and md5.
   // 3) Gets PlatformFileInfo of the modified local cache file.
   // 4) Gets GDataEntry for |file_path|.
   // 5) Modifies GDataEntry using the new PlatformFileInfo.
   // 6) Commits the modification to the cache system.
   // 7) Invokes the user-supplied |callback|.
+  // |callback| must not be null.
   void OnGetEntryInfoCompleteForCloseFile(
       const FilePath& file_path,
       const FileOperationCallback& callback,
       GDataFileError error,
       scoped_ptr<GDataEntryProto> entry_proto);
   void OnGetCacheFilePathCompleteForCloseFile(
       const FilePath& file_path,
       const FileOperationCallback& callback,
       GDataFileError error,
       const std::string& resource_id,
       const std::string& md5,
       const FilePath& local_cache_path);
   void OnGetModifiedFileInfoCompleteForCloseFile(
       const FilePath& file_path,
       base::PlatformFileInfo* file_info,
       bool* get_file_info_result,
       const FileOperationCallback& callback);
   void OnGetEntryCompleteForCloseFile(
-      const FilePath& file_path,
       const base::PlatformFileInfo& file_info,
       const FileOperationCallback& callback,
       GDataFileError error,
       GDataEntry* entry);
   void OnCommitDirtyInCacheCompleteForCloseFile(
       const FileOperationCallback& callback,
       GDataFileError error,
       const std::string& resource_id,
       const std::string& md5);
   void OnCloseFileFinished(const FilePath& file_path,
@@ skipping 555 matching lines @@
   // invalidate the weak pointers before any other members are destroyed.
   base::WeakPtrFactory<GDataFileSystem> ui_weak_ptr_factory_;
   // Unlike other classes, we need this as we need this to redirect a task
   // from IO thread to UI thread.
   base::WeakPtr<GDataFileSystem> ui_weak_ptr_;
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_FILE_SYSTEM_H_