Revert of Copy WebFrameImpl.{cpp,h} to TextFinder.{cpp,h}

Revert of Copy WebFrameImpl.{cpp,h} to TextFinder.{cpp,h} (https://codereview.chromium.org/119113003/)

Reason for revert:
The follow-up patch was reverted.

I guess it would be easier to do the copy and refactoring in one CL, so we don't end up with a copy of WebFrameImpl.* that gets stale before the refactoring is finished.

Original issue's description:
> Copy WebFrameImpl.{cpp,h} to TextFinder.{cpp,h}
> 
> This patch copies Source/web/WebFrameImpl.{cpp,h} into Source/web/TextFinder.{cpp,h} for decoupling WebFrameImpl and text finder.
> 
> Another patch will complete decoupling.
> 
> BUG=
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=164490

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

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=165120

[jochen (gone - plz use gerrit), 2014-01-15 13:13:44]

Created Revert of Copy WebFrameImpl.{cpp,h} to TextFinder.{cpp,h}

[commit-bot: I haz the power, 2014-01-15 13:28:55]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jochen@chromium.org/139383002/80001

[commit-bot: I haz the power, 2014-01-15 13:46:14]

Change committed as 165120

[tkent, 2014-01-16 01:43:45]

lgtm