Revert of Classify navigations without page id in parallel to the existing classifier.

Revert of Classify navigations without page id in parallel to the existing classifier. (patchset #35 id:680001 of https://codereview.chromium.org/1002803002/)

Reason for revert:
Very flaky on ChromeOS debug bots. See crbug.com/481910

Original issue's description:
> Classify navigations without page id in parallel to the existing classifier.
>
> For now, this only happens in debug builds.
>
> BUG=369661
> TEST=NavigationControllerBrowserTest.NavigationTypeClassification_*
> TEST=Every other test on the planet.
>
> Committed: https://crrev.com/d8d93348bbd8c646c337bdaa40fc0c64204fc5ff
> Cr-Commit-Position: refs/heads/master@{#327122}
>
> Reverted: https://crrev.com/5348e920f4119aff9a4eb76c0965725dc85a66cc
> Cr-Revert-Position: refs/heads/master@{#327152}
>
> Committed: https://crrev.com/5671403d44971669e4d81aecf3f002188ce0e95f
> Cr-Commit-Position: refs/heads/master@{#327214}

TBR=phajdan.jr@chromium.org,clamy@chromium.org,creis@chromium.org,hajimehoshi@chromium.org,isherman@chromium.org,jeremyim@chromium.org,mattm@chromium.org,mnaganov@chromium.org,mvanouwerkerk@chromium.org,nasko@chromium.org,stevenjb@chromium.org,bengr@chromium.org,cpu@chromium.org,avi@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=369661
Committed: https://crrev.com/49180eb13549e440bbd4f66390e32e84699dcdfd
Cr-Commit-Position: refs/heads/master@{#327269}

[vkuzkokov, 2015-04-28 12:06:05]

Created Revert of Classify navigations without page id in parallel to the
existing classifier.

[commit-bot: I haz the power, 2015-04-28 12:06:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1110943003/1

[commit-bot: I haz the power, 2015-04-28 12:07:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-28 12:08:03]

Patchset 1 (id:??) landed as
https://crrev.com/49180eb13549e440bbd4f66390e32e84699dcdfd
Cr-Commit-Position: refs/heads/master@{#327269}