Pepper: FileDownloader cleanup.

More cleaning up of unused code in FileDownloader.

BUG=239656

Review URL: https://codereview.chromium.org/293403008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273417 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed