Change media galleries to external file system type to add toURL support

chrome/browser/media_galleries/fileapi/device_media_async_file_util.cc

 // Copyright (c) 2013 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/media_galleries/fileapi/device_media_async_file_util.h"
 
 #include "base/callback.h"
 #include "base/file_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/task_runner_util.h"
@@ skipping 31 matching lines @@
 // contents of |device_file_path|. The snapshot file is created in
 // "profile_path/kDeviceMediaAsyncFileUtilTempDir" directory. If the snapshot
 // file is created successfully, |snapshot_file_path| will be a non-empty file
 // path. In case of failure, the |snapshot_file_path| will be an empty file
 // path.
 void CreateSnapshotFileOnBlockingPool(
     const base::FilePath& device_file_path,
     const base::FilePath& profile_path,
     base::FilePath* snapshot_file_path) {
   DCHECK(snapshot_file_path);
-  base::FilePath isolated_media_file_system_dir_path =
+  base::FilePath media_file_system_dir_path =
       profile_path.AppendASCII(kDeviceMediaAsyncFileUtilTempDir);
-  if (!base::CreateDirectory(isolated_media_file_system_dir_path) ||
-      !base::CreateTemporaryFileInDir(isolated_media_file_system_dir_path,
+  if (!base::CreateDirectory(media_file_system_dir_path) ||
+      !base::CreateTemporaryFileInDir(media_file_system_dir_path,
                                       snapshot_file_path)) {
     LOG(WARNING) << "Could not create media snapshot file "
-                 << isolated_media_file_system_dir_path.value();
+                 << media_file_system_dir_path.value();
     *snapshot_file_path = base::FilePath();
   }
 }
 
 }  // namespace
 
 DeviceMediaAsyncFileUtil::~DeviceMediaAsyncFileUtil() {
 }
 
 // static
@@ skipping 296 matching lines @@
       url.path(),  // device file path
       *snapshot_file_path,
       base::Bind(&DeviceMediaAsyncFileUtil::OnDidCreateSnapshotFile,
                  weak_ptr_factory_.GetWeakPtr(),
                  callback,
                  make_scoped_refptr(context->task_runner())),
       base::Bind(&DeviceMediaAsyncFileUtil::OnCreateSnapshotFileError,
                  weak_ptr_factory_.GetWeakPtr(),
                  callback));
 }