Revert of Fix incorrect number of matches and misleading highlighting in "Find on Page" results (https://codereview.chromium.org/422443004/)

Reason for revert:
This broke FindInPageControllerTest.LargePage on multiple bots (e.g. http://build.chromium.org/p/chromium.win/builders/Win7%20Tests%20%282%29/builds/30423)

Filed a bug:
https://code.google.com/p/chromium/issues/detail?id=398017

Original issue's description:
> Fix incorrect number of matches and misleading highlighting in "Find on Page" results.
> 
> BUG= 397563
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=179000

TBR=yosin@chromium.org,tkent@chromium.org,iceman@yandex-team.ru
NOTREECHECKS=true
NOTRY=true
BUG= 397563

Review URL: https://codereview.chromium.org/424803002

git-svn-id: svn://svn.chromium.org/blink/trunk@179036 bbb929c8-8fbe-4397-9dbb-9b2b20218538