Move device notification impl out of chrome/browser/media_gallery

chrome/browser/media_gallery/media_device_notifications_utils.cc

-// 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.
-
-#include "chrome/browser/media_gallery/media_device_notifications_utils.h"
-
-#include "base/file_util.h"
-#include "base/string_util.h"
-#include "content/public/browser/browser_thread.h"
-
-namespace {
-
-#if defined(OS_WIN)
-const wchar_t kDCIMDirName[] = L"DCIM";
-#else
-const char kDCIMDirName[] = "DCIM";
-#endif
-
-}  // namespace
-
-namespace chrome {
-
-bool IsMediaDevice(const FilePath::StringType& mount_point) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
-
-  FilePath dcim_path(mount_point);
-  FilePath::StringType dcim_dir = kDCIMDirName;
-  if (!file_util::DirectoryExists(dcim_path.Append(dcim_dir))) {
-    // Check for lowercase 'dcim' as well.
-    FilePath dcim_path_lower(dcim_path.Append(StringToLowerASCII(dcim_dir)));
-    if (!file_util::DirectoryExists(dcim_path_lower))
-      return false;
-  }
-  return true;
-}
-
-}  // namespace chrome