[Android] Always cache local files.
[Android] Always cache local files.

It's best not to cache them on desktop, because someone might be
developing locally. On Android, that's not likely to be the case and
is a significant perf hit.

BUG=292959

Review URL: https://chromiumcodereview.appspot.com/23431035

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@157991 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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