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

chrome/browser/chromeos/file_manager/filesystem_api_util.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/chromeos/file_manager/filesystem_api_util.h"
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chromeos/drive/file_errors.h"
@@ skipping 113 matching lines @@
     const base::Callback<void(bool)>& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   // TODO(kinaba): support other types of volumes besides Drive.
   drive::util::CheckDirectoryExists(
       profile,
       path,
       base::Bind(&CheckDirectoryAfterDriveCheck, callback));
 }
 
-void PrepareNonNativeLocalPathWritableFile(
+void PrepareNonNativeLocalPathFileForWritableApp(
     Profile* profile,
     const base::FilePath& path,
     const base::Callback<void(bool)>& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   // TODO(kinaba): support other types of volumes besides Drive.
   drive::util::PrepareWritableFileAndRun(
       profile,
       path,
       base::Bind(&CheckWritableAfterDriveCheck, callback));
 }
 
 }  // namespace util
 }  // namespace file_manager