Remove old WebSocket implementation from content/

Remove old WebSocket implementation from content/

Remove the old SocketStream-based WebSocket implementation from
content/.

Large parts of the implementation still exist in net/. They will be
removed in a subsequent CL.

There are also a few traces in chrome/, and some interfaces in Blink
that cannot be removed until this CL is submitted.

BUG=423201
TEST=layout tests, browser_tests

Committed: https://crrev.com/8e60ab5d142eaa8c04a385f265f1c328ad5a9b6d
Cr-Commit-Position: refs/heads/master@{#301075}

[Adam Rice, 2014-10-21 13:46:31]

ricea@chromium.org changed reviewers:
+ yhirano@chromium.org

[yhirano, 2014-10-23 01:53:48]

lgtm

[Adam Rice, 2014-10-23 04:18:06]

ricea@chromium.org changed reviewers:
+ nasko@chromium.org

[Adam Rice, 2014-10-23 04:18:07]

+nasko for content/

[nasko, 2014-10-23 17:20:41]

Code removal is awesome! LGTM

[Adam Rice, 2014-10-24 07:41:13]

The CQ bit was checked by ricea@chromium.org

[commit-bot: I haz the power, 2014-10-24 07:41:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/655253006/20001

[commit-bot: I haz the power, 2014-10-24 08:33:51]

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

[commit-bot: I haz the power, 2014-10-24 08:33:53]

Failed to request the patch to try. Please note that binary files are still
unsupported at the moment, this is being worked on.

Thanks for your patience.

Transient error: <urlopen error timed out>

[commit-bot: I haz the power, 2014-10-24 08:33:59]

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

[Adam Rice, 2014-10-24 08:52:01]

The CQ bit was checked by ricea@chromium.org

[commit-bot: I haz the power, 2014-10-24 08:53:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/655253006/20001

[commit-bot: I haz the power, 2014-10-24 08:54:03]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-10-24 08:54:51]

Patchset 2 (id:??) landed as
https://crrev.com/8e60ab5d142eaa8c04a385f265f1c328ad5a9b6d
Cr-Commit-Position: refs/heads/master@{#301075}