Rename "CheckWritable" to "PrepareForWritableApp" to reflect the actual behavior.

chrome/browser/extensions/api/file_system/file_system_api.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_EXTENSIONS_API_FILE_SYSTEM_FILE_SYSTEM_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_FILE_SYSTEM_FILE_SYSTEM_API_H_
 
 #include <vector>
 
 #include "base/files/file_path.h"
@@ skipping 35 matching lines @@
 class FileSystemEntryFunction : public ChromeAsyncExtensionFunction {
  protected:
   FileSystemEntryFunction();
 
   virtual ~FileSystemEntryFunction() {}
 
   // This is called when writable file entries are being returned. The function
   // will ensure the files exist, creating them if necessary, and also check
   // that none of the files are links. If it succeeds it proceeds to
   // RegisterFileSystemsAndSendResponse, otherwise to HandleWritableFileError.
-  void CheckWritableFiles(const std::vector<base::FilePath>& path);
+  void PrepareFilesForWritableApp(const std::vector<base::FilePath>& path);
 
   // This will finish the choose file process. This is either called directly
   // from FilesSelected, or from WritableFileChecker. It is called on the UI
   // thread.
   void RegisterFileSystemsAndSendResponse(
       const std::vector<base::FilePath>& path);
 
   // Creates a response dictionary and sets it as the response to be sent.
   void CreateResponse();
 
@@ skipping 140 matching lines @@
   DECLARE_EXTENSION_FUNCTION("fileSystem.restoreEntry", FILESYSTEM_RESTOREENTRY)
 
  protected:
   virtual ~FileSystemRestoreEntryFunction() {}
   virtual bool RunAsync() OVERRIDE;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_FILE_SYSTEM_FILE_SYSTEM_API_H_