Revert of https://codereview.chromium.org/123613002/
Reason for revert: Now the original patch can be reapplied after crbug.com/330141 is fixed.

TBR=vollick@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=258219

Review URL: https://codereview.chromium.org/129453002

git-svn-id: svn://svn.chromium.org/blink/trunk@164712 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Move HistoryController to core/page/ and HistoryItem to core/loader/

HistoryController is no longer used in core/ outside of core/page/, and will
eventually move to the browser process along with the rest of core/page/.

HistoryItem is the only class left in core/history/, and is conceptually part
of the loader, so move it to core/loader/ and delete core/history/

BUG=none

Review URL: https://codereview.chromium.org/129243002

git-svn-id: svn://svn.chromium.org/blink/trunk@164713 bbb929c8-8fbe-4397-9dbb-9b2b20218538