base::Bind: Convert FileUtilProxy::EnsureFileExistsCallback.

base/file_util_proxy.h

 // Copyright (c) 2011 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 BASE_FILE_UTIL_PROXY_H_
 #define BASE_FILE_UTIL_PROXY_H_
 
 #include <vector>
 
 #include "base/base_export.h"
@@ skipping 27 matching lines @@
   // The ownership of |callback| is taken by the function and will always be
   // deleted by the function even on failure.
   typedef Callback1<PlatformFileError /* error code */>::Type StatusCallback;
 
   typedef base::Callback<void(PlatformFileError /* error code */,
                               PassPlatformFile,
                               bool /* created */)> CreateOrOpenCallback;
   typedef base::Callback<void(PlatformFileError /* error code */,
                               PassPlatformFile,
                               FilePath)> CreateTemporaryCallback;
-  typedef Callback2<PlatformFileError /* error code */,
-                    bool /* created */>::Type EnsureFileExistsCallback;
+  typedef base::Callback<void(PlatformFileError /* error code */,
+                              bool /* created */)> EnsureFileExistsCallback;
   typedef Callback2<PlatformFileError /* error code */,
                     const PlatformFileInfo& /* file_info */
                     >::Type GetFileInfoCallback;
   typedef Callback2<PlatformFileError /* error code */,
                     const std::vector<Entry>&>::Type ReadDirectoryCallback;
   typedef Callback3<PlatformFileError /* error code */,
                     const char* /* data */,
                     int /* bytes read/written */>::Type ReadCallback;
   typedef Callback2<PlatformFileError /* error code */,
                     int /* bytes written */>::Type WriteCallback;
@@ skipping 32 matching lines @@
   // If a new file han not existed and is created at the |file_path|,
   // |created| of the callback argument is set true and |error code|
   // is set PLATFORM_FILE_OK.
   // If the file already exists, |created| is set false and |error code|
   // is set PLATFORM_FILE_OK.
   // If the file hasn't existed but it couldn't be created for some other
   // reasons, |created| is set false and |error code| indicates the error.
   static bool EnsureFileExists(
       scoped_refptr<MessageLoopProxy> message_loop_proxy,
       const FilePath& file_path,
-      EnsureFileExistsCallback* callback);
+      const EnsureFileExistsCallback& callback);
 
   // Retrieves the information about a file. It is invalid to pass NULL for the
   // callback.
   static bool GetFileInfo(
       scoped_refptr<MessageLoopProxy> message_loop_proxy,
       const FilePath& file_path,
       GetFileInfoCallback* callback);
 
   static bool GetFileInfoFromPlatformFile(
       scoped_refptr<MessageLoopProxy> message_loop_proxy,
@@ skipping 108 matching lines @@
       PlatformFile file,
       StatusCallback* callback);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(FileUtilProxy);
 };
 
 }  // namespace base
 
 #endif  // BASE_FILE_UTIL_PROXY_H_