Revert of Remove 'blink::WebSerializedOrigin' (1/3)

Revert of Remove 'blink::WebSerializedOrigin' (1/3) (patchset #2 id:20001 of https://codereview.chromium.org/1232563003/)

Reason for revert:
Blocking the roll; fails on http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_gn_rel/builds/108650 for some reason. :/

Original issue's description:
> Remove 'blink::WebSerializedOrigin' (1/3)
> 
> As part of the plan to rationalize Origins across Blink and its embedder,
> we're dropping 'blink::WebSerializedOrigin' in favor of
> 'blink::WebSecurityOrigin' (which can serialize itself just fine).
> 
> Patch 1 (Blink): This patch.
> Patch 2 (Chromium): https://codereview.chromium.org/1229783005
> Patch 3 (Blink): https://codereview.chromium.org/1231643010
> 
> BUG=508896
> R=jochen@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=198731

TBR=jochen@chromium.org,peter@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=508896
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=198733

[Mike West, 2015-07-11 12:50:25]

Created Revert of Remove 'blink::WebSerializedOrigin' (1/3)

[commit-bot: I haz the power, 2015-07-11 12:50:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1235673003/1

[commit-bot: I haz the power, 2015-07-11 12:51:03]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=198733