android: Remove dont-prefetch-libraries flag, as it is unused.

Change-Id: Ia016c7beb92702de095fd40472f0327b907816d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1581633
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653714}
7 files changed