Revert of Add queryForNewLocalDevices to gcdPrivate

Revert of Add queryForNewLocalDevices to gcdPrivate (https://codereview.chromium.org/356613002/)

Reason for revert:
Test failure in Builder: Win7 Tests (dbg)(6)

[ RUN      ] GcdPrivateAPITest.SendQuery
[4036:2900:0709/150928:ERROR:singleton_hwnd.cc(43)] Cannot create windows on non-UI thread!
[956:2412:0709/150928:WARNING:extension_apitest.cc(282)] Workaround for 177163, prematurely returning
c:\b\build\slave\win_builder__dbg_\build\src\chrome\browser\extensions\api\gcd_private\gcd_private_apitest.cc(276): error: Actual function call count doesn't match EXPECT_CALL(*test_service_discovery_client_, OnSendTo(std::string(reinterpret_cast\u003Cconst char*>(kQueryPacket), sizeof(kQueryPacket))))...
         Expected: to be called twice
           Actual: never called - unsatisfied and active
[  FAILED  ] GcdPrivateAPITest.SendQuery, where TypeParam =  and GetParam() =  (5746 ms)

http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%286%29
http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%286%29/builds/27654
http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%28dbg%29%286%29/builds/27654/steps/browser_tests/logs/SendQuery

Original issue's description:
> Add function queryForNewLocalDevices to send query for new local devices,
> implement it for mDNS (WiFi devices forthcoming)
> 
> BUG=383167
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=282098

[horo, 2014-07-10 01:24:32]

Created Revert of Add queryForNewLocalDevices to gcdPrivate

[commit-bot: I haz the power, 2014-07-10 01:27:30]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/horo@chromium.org/384503003/1

[commit-bot: I haz the power, 2014-07-10 01:27:31]

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

[commit-bot: I haz the power, 2014-07-10 01:27:32]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.