arc: Reduce logspam when ARC is not enabled/available
There are some Chrome services that unconditionally try to call ARC
code, and the latter will print stuff to the log if it's not enabled or
avilable (yet). This change ensures that we only attempt to contact ARC
when it is actually ready for the most chatty services: net and process.
BUG=654038
TEST=Opted out of ARC, did not see any logs
Review-Url: https://codereview.chromium.org/2541843003
Cr-Commit-Position: refs/heads/master@{#435534}
4 files changed
