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 153 matching lines @@
                                      base::Bind(callback, false));
     return;
   }
 
   util::CheckIfDirectoryExists(
       GetFileSystemContextForExtensionId(profile, kFileManagerAppId),
       url,
       base::Bind(&BoolCallbackAsFileErrorCallback, callback));
 }
 
-void PrepareNonNativeLocalPathWritableFile(
+void PrepareNonNativeLocalFileForWritableApp(
     Profile* profile,
     const base::FilePath& path,
     const base::Callback<void(bool)>& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   DCHECK(IsUnderNonNativeLocalPath(profile, path));
 
   GURL url;
   if (!util::ConvertAbsoluteFilePathToFileSystemUrl(
            profile, path, kFileManagerAppId, &url)) {
     // Posting to the current thread, so that we always call back asynchronously
@@ skipping 16 matching lines @@
       content::BrowserThread::IO,
       FROM_HERE,
       base::Bind(&PrepareFileOnIOThread,
                  make_scoped_refptr(context),
                  context->CrackURL(url),
                  google_apis::CreateRelayCallback(callback)));
 }
 
 }  // namespace util
 }  // namespace file_manager