Remove 'blink::WebSerializedOrigin' (7/7)

Remove 'blink::WebSerializedOrigin' (7/7)

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): https://codereview.chromium.org/1240083002
Patch 3 (Blink): https://codereview.chromium.org/1244703002
Patch 4 (Chromium): https://codereview.chromium.org/1229783005
Patch 5 (Chromium): https://codereview.chromium.org/1247723004/
Patch 6 (Blink): https://codereview.chromium.org/1231643010
Patch 7 (Chromium): This patch.

BUG=508896
R=jochen@chromium.org

Committed: https://crrev.com/b5dc9fd49be7cc5f410cdaf94e131862766ee372
Cr-Commit-Position: refs/heads/master@{#339648}

[Mike West, 2015-07-21 09:08:48]

More sobs.

(Patch 5 now just forward declares the thing I'm removing. This patch kills it.)

[jochen (gone - plz use gerrit), 2015-07-21 09:14:29]

lgtm

[Mike West, 2015-07-21 14:03:28]

The CQ bit was checked by mkwst@chromium.org

[commit-bot: I haz the power, 2015-07-21 14:03:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1246943002/1

[commit-bot: I haz the power, 2015-07-21 14:24:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-21 14:25:17]

Patchset 1 (id:??) landed as
https://crrev.com/b5dc9fd49be7cc5f410cdaf94e131862766ee372
Cr-Commit-Position: refs/heads/master@{#339648}