Revert of Use enum BinaryType for WebSocket.binaryType, instead of DOMString

Revert of Use enum BinaryType for WebSocket.binaryType, instead of DOMString (patchset #7 id:120001 of https://codereview.chromium.org/871013007/)

Reason for revert:
Failing in gtests:

https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.8/builds/35898/steps/webkit_unit_tests/logs/DOMWebSocketDeathTest.binaryType

[WARNING] ../../testing/gtest/src/gtest-death-test.cc:825:: Death tests use fork(), which is unsafe particularly in a threaded context. For this test, Google Test detected 5 threads.
../../third_party/WebKit/Source/modules/websockets/DOMWebSocketTest.cpp:687: Failure
Death test: m_websocket->setBinaryType("hoge")
    Result: failed to die.
 Error msg:
[  DEATH   ]
[  FAILED  ] DOMWebSocketDeathTest.binaryType (5 ms)


Original issue's description:
> This addresses a FIXME in WebSocket.idl
> 
> Also removing logging for wrong value as now we are logging in binding code:
> https://codereview.chromium.org/955413002/.
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=193201

TBR=habib.virji@samsung.com,nbarth@chromium.org,yutak@chromium.org,tyoshino@chromium.org,haraken@chromium.org,bashi@chromium.org,paritosh.in@samsung.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=193206

[jsbell, 2015-04-06 19:10:36]

Created Revert of Use enum BinaryType for WebSocket.binaryType, instead of
DOMString

[commit-bot: I haz the power, 2015-04-06 19:10:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1053013006/1

[commit-bot: I haz the power, 2015-04-06 19:11:31]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=193206

[Nils Barth (inactive), 2015-04-06 19:14:06]

LGTM.
Looks like we can't use death tests?

[jsbell, 2015-04-06 19:15:56]

On 2015/04/06 19:14:06, Nils Barth (inactive) wrote:
> LGTM.
> Looks like we can't use death tests?

Seems so. I'd never seen them used before. We should just remove
DOMWebSocketDeathTest from the CL.

[haraken, 2015-04-06 23:21:02]

LGTM