Revert of Revert of Fix CH Width header when preloadScanner and <picture> are involved

Revert of Revert of Fix CH Width header when preloadScanner and <picture> are involved (patchset #1 id:1 of https://codereview.chromium.org/1217703002/)

Reason for revert:
Wasn't the cause of build 7701 failure, was a bot flake.

Original issue's description:
> Revert of Fix CH Width header when preloadScanner and <picture> are involved (patchset #3 id:40001 of https://codereview.chromium.org/1214663004/)
> 
> Reason for revert:
> Seems to have broken the Mac10.9 Tests (dbg) on the chromium waterfall, see build #7701
> 
> 
> 
> Original issue's description:
> > Fix CH Width header when preloadScanner and <picture> are involved
> > 
> > When images are loaded by the preloader and <picture> is involved,
> > there was a bug where the sent sizes value was related to the fallback
> > <img> tag rather than the picked resource.
> > This CL fixes that.
> > 
> > BUG=458983
> > 
> > Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197948
> 
> TBR=mkwst@chromium.org,yoav@yoav.ws
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=458983
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197949

TBR=mkwst@chromium.org,yoav@yoav.ws
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=458983
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197950

[Noel Gordon, 2015-06-28 18:25:09]

Created Revert of Revert of Fix CH Width header when preloadScanner and
<picture> are involved

[commit-bot: I haz the power, 2015-06-28 18:25:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1220443004/1

[commit-bot: I haz the power, 2015-06-28 18:25:36]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197950

[Yoav Weiss, 2015-06-28 18:27:05]

On 2015/06/28 18:25:36, commit-bot: I haz the power wrote:
> Committed patchset #1 (id:1) as
> https://src.chromium.org/viewvc/blink?view=rev&revision=197950

Since I don't see something that seems related to the change in question on
http://build.chromium.org/p/chromium.mac/builders/Mac10.9%20Tests%20%28dbg%29...
, LGTM

[Noel Gordon, 2015-06-28 18:28:56]

Just a bot flake by the looks.

[Noel Gordon, 2015-06-28 18:47:36]

CH == Client Hints ?

[Yoav Weiss, 2015-06-28 18:49:09]

Yeah, client hints
On Jun 28, 2015 20:47, <noel@chromium.org> wrote:

> CH == Client Hints ?
>
> https://codereview.chromium.org/1220443004/
>

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