Remove the deprecated messageevent API

Remove the deprecated messageevent API

BUG=473258
Message ports were using the source frame's execution context
rather than the targets when ports were transferred from a frame
to another. This seems to be leaky and also creates difficulties
when implementing message port support for android webview
and OOPIF. Use the target instead.

This is patch 3 of 3 and removes the deprecated API.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=200786

[sgurun-gerrit only, 2015-08-19 00:13:17]

sgurun@chromium.org changed reviewers:
+ dcheng@chromium.org

[sgurun-gerrit only, 2015-08-19 00:13:28]

On 2015/08/19 00:13:17, sgurun wrote:
> mailto:sgurun@chromium.org changed reviewers:
> + mailto:dcheng@chromium.org

PTAL, thanks

[dcheng, 2015-08-19 00:55:03]

lgtm

[sgurun-gerrit only, 2015-08-19 00:58:09]

The CQ bit was checked by sgurun@chromium.org

[commit-bot: I haz the power, 2015-08-19 00:58:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1304553002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1304553002/20001

[commit-bot: I haz the power, 2015-08-19 01:50:52]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-19 01:50:53]

Try jobs failed on following builders:
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[sgurun-gerrit only, 2015-08-19 02:08:32]

The CQ bit was checked by sgurun@chromium.org

[commit-bot: I haz the power, 2015-08-19 02:08:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1304553002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1304553002/20001

[commit-bot: I haz the power, 2015-08-19 03:06:04]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=200786