Policy for network annotation of doodle_fetcher_impl updated.

DefaultSearchProviderEnabled added as disabling policy of network request in:
components/doodle/doodle_fetcher_impl.cc

BUG=

Review-Url: https://codereview.chromium.org/2890373002
Cr-Commit-Position: refs/heads/master@{#473252}
1 file changed