Revert of Implement $Secure- cookie prefix

Revert of Implement $Secure- cookie prefix (patchset #16 id:420001 of https://codereview.chromium.org/1393193005/ )

Reason for revert:
Broke net_unittests on Android:

I   63.275s run_tests_on_device(06b2a92a003bca26)  [ RUN      ] URLRequestTest.SecureCookiePrefixOnNonsecureOrigin
I   63.275s run_tests_on_device(06b2a92a003bca26)  [ERROR:spawner_communicator.cc(241)] request failed, status: 3, error: -324
I   63.275s run_tests_on_device(06b2a92a003bca26)  ../../net/url_request/url_request_unittest.cc:2737: Failure
I   63.276s run_tests_on_device(06b2a92a003bca26)  Value of: test_server_https.Start()
I   63.276s run_tests_on_device(06b2a92a003bca26)    Actual: false
I   63.276s run_tests_on_device(06b2a92a003bca26)  Expected: true
I   63.276s run_tests_on_device(06b2a92a003bca26)  [ERROR:spawner_communicator.cc(241)] request failed, status: 3, error: -324
I   63.276s run_tests_on_device(06b2a92a003bca26)  [  FAILED  ] URLRequestTest.SecureCookiePrefixOnNonsecureOrigin (487 ms)

http://build.chromium.org/p/chromium.linux/builders/Android%20Tests%20%28dbg%29/builds/30742
http://build.chromium.org/p/chromium.linux/builders/Android%20Tests/builds/22819

Original issue's description:
> Implement $Secure- cookie prefix
>
> This CL implements the rule that cookies whose names start with
> $Secure- can only be set if the Secure attribute is enabled. The
> implementation is a runtime-enabled web platform feature for now.
>
> Intent to Implement:
> https://groups.google.com/a/chromium.org/d/msg/blink-dev/IU5t6eLuS2Y/Uq-7Kat9BwAJ
>
> BUG=541511
> TBR=droger@chromium.org
>
> Committed: https://crrev.com/467a098174e062d4380eb0ad8f7b2f0b0b7ed5fa
> Cr-Commit-Position: refs/heads/master@{#354676}

TBR=mkwst@chromium.org,jochen@chromium.org,mmenke@chromium.org,droger@chromium.org,estark@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=541511
Committed: https://crrev.com/c236d3b2efe063dc0914e2bebdb4c28cac7fa6c2
Cr-Commit-Position: refs/heads/master@{#354736}

[Mattias Nissler (ping if slow), 2015-10-19 08:07:33]

Created Revert of Implement $Secure- cookie prefix

[commit-bot: I haz the power, 2015-10-19 08:07:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1409243003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1409243003/1

[commit-bot: I haz the power, 2015-10-19 08:08:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-19 08:09:47]

Patchset 1 (id:??) landed as
https://crrev.com/c236d3b2efe063dc0914e2bebdb4c28cac7fa6c2
Cr-Commit-Position: refs/heads/master@{#354736}