Revert of Net-related fixups for scoped_refptr conversion operator cleanup. (patchset #2 of https://codereview.chromium.org/511163002/)

Reason for revert:
It seems to be breaking GPU Mac Builder (Blink):
http://build.chromium.org/p/chromium.webkit/builders/GPU%20Mac%20Builder/builds/19306/steps/compile/logs/stdio

Original issue's description:
> Net-related fixups for scoped_refptr conversion operator cleanup.
>
> BUG=110610
> TBR=pkasting@chromium.org
>
> Committed: https://chromium.googlesource.com/chromium/src/+/aa3dd9e5a2d3215f9c756ddcbb11268569cbe473

TBR=mmenke@chromium.org,rsleevi@chromium.org,pkasting@chromium.org,dcheng@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=110610

Review URL: https://codereview.chromium.org/517873003

Cr-Commit-Position: refs/heads/master@{#292606}
15 files changed