Move temp file functions to base namespace.

chrome/browser/media_galleries/fileapi/device_media_async_file_util.cc

Index: chrome/browser/media_galleries/fileapi/device_media_async_file_util.cc
diff --git a/chrome/browser/media_galleries/fileapi/device_media_async_file_util.cc b/chrome/browser/media_galleries/fileapi/device_media_async_file_util.cc
index 63a553cf1dde97b84cf11158c9ca091c9b917dda..5087660829945da40551d3aa7f4383ab399cb9ac 100644
--- a/chrome/browser/media_galleries/fileapi/device_media_async_file_util.cc
+++ b/chrome/browser/media_galleries/fileapi/device_media_async_file_util.cc
@@ -46,8 +46,8 @@ void CreateSnapshotFileOnBlockingPool(
   base::FilePath isolated_media_file_system_dir_path =
       profile_path.AppendASCII(kDeviceMediaAsyncFileUtilTempDir);
   if (!file_util::CreateDirectory(isolated_media_file_system_dir_path) ||
-      !file_util::CreateTemporaryFileInDir(isolated_media_file_system_dir_path,
-                                           snapshot_file_path)) {
+      !base::CreateTemporaryFileInDir(isolated_media_file_system_dir_path,
+                                      snapshot_file_path)) {
     LOG(WARNING) << "Could not create media snapshot file "
                  << isolated_media_file_system_dir_path.value();
     *snapshot_file_path = base::FilePath();