Revert of Convert network hints to Mojo (patchset #16 id:300001 of https://codereview.chromium.org/2144533002/ )

BUG=630749
NOPRESUBMIT=true

Skipping presubmit as I'm removing OWNERS files I added.

Reason for revert:
Use-after-free issue:

https://bugs.chromium.org/p/chromium/issues/detail?id=630749

Original issue's description:
> Convert network hints to Mojo
>
> Previously landed as: refs/heads/master@{#406780}
>
> Committed: https://crrev.com/1efd0ad3153587609220eeec1be6c1b2bbf9964b
> Cr-Commit-Position: refs/heads/master@{#407030}

[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected]
# Not skipping CQ checks because original CL landed more than 1 days ago.

Review-Url: https://codereview.chromium.org/2179693002
Cr-Commit-Position: refs/heads/master@{#407395}
41 files changed