Revert "Re-land: Add download_file_types.proto with ascii->binary conversion, as a resource."

This reverts commit d6e8e6aaa8d07a0d576adbd2dafd0789b124660e.

Note: This revert deletes some files / code that were modified later,
but were fixes to this change and should be easily recoverable.

BUG=605592
TBR=nparker@chromium.org, xyzzyz@chromium.org,

Review URL: https://codereview.chromium.org/1911883002

Cr-Commit-Position: refs/heads/master@{#388960}
10 files changed