Remove 'blink::WebSerializedOrigin' (2/4)

Remove 'blink::WebSerializedOrigin' (2/4)

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 (Chromium): https://codereview.chromium.org/1244563002
Patch 2 (Blink): This patch.
Patch 3 (Chromium): https://codereview.chromium.org/1229783005
Patch 4 (Blink): https://codereview.chromium.org/1231643010

------------------------------------------------------------------------
This is a re-land of https://codereview.chromium.org/1232563003, which
was reverted due to compilation errors that the CQ didn't catch.
------------------------------------------------------------------------

BUG=508896
R=jochen@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=199097

[Mike West, 2015-07-17 08:45:08]

This is exactly the same as the patch you LGTM'd a few days ago, but it now
relies on the new patch #1 I just sent you. Hooray for more-sided patches!

Mind stamping it?

[Mike West, 2015-07-17 08:45:13]

The CQ bit was checked by mkwst@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-07-17 08:45:31]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1240083002/1

[jochen (gone - plz use gerrit), 2015-07-17 09:26:35]

lgtm

[Mike West, 2015-07-17 09:56:58]

The CQ bit was unchecked by mkwst@chromium.org

[Mike West, 2015-07-17 09:57:25]

The CQ bit was checked by mkwst@chromium.org

[commit-bot: I haz the power, 2015-07-17 09:57:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1240083002/1

[commit-bot: I haz the power, 2015-07-17 11:06:10]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=199097