This reverts commit 3f40c42b.

Reason for revert: ast.literal_eval(False) doesn't work?

Original change's description:
> Don't fetch flash when fetching android_internal.
> 
> Bug: 856278
> Change-Id: I89eccc7581daedda69dee4f99d174e8cb49c6ba1
> Reviewed-on: https://chromium-review.googlesource.com/c/1342730
> Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
> Commit-Queue: John Budorick <jbudorick@chromium.org>

TBR=ehmaldonado@chromium.org,jbudorick@chromium.org

Change-Id: Iffb655701830984e47a2b8e7629f0ed87886a401
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 856278
Reviewed-on: https://chromium-review.googlesource.com/c/1344637Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>