Revert of Handling new frames and frame navigations with find-in-page during a find session. (patchset #2 id:120001 of https://codereview.chromium.org/2236403004/ )

Reason for revert:
This seems to be failing pretty consistently on some bots (e.g. https://uberchromegw.corp.google.com/i/chromium.win/builders/Win7%20Tests%20%28dbg%29%281%29)

Original issue's description:
> Handling new frames and frame navigations with find-in-page during a find session.
>
> This patch implements new find-in-page functionality that allows for frames that are either newly added or navigated during a find session to be automatically searched so that matches in their new content are automatically highlighted and included in the results shown in the find bar.
>
> Also, there is a fix included in this patch to prevent the find-in-page bar from closing when a subframe navigates (the find session should only end if the main frame navigates).
>
> Design doc: https://docs.google.com/document/d/1r4F19FIKg4zPJCaSyJ9-T0sgFbxlCGKL3FjqQEAKegg/view
>
> BUG=2220,621660
>
> Committed: https://crrev.com/ec9c7f30eb10ab3fc9ab6707f7b736446ab89aa1
> Cr-Commit-Position: refs/heads/master@{#420715}

TBR=dcheng@chromium.org,pkasting@chromium.org,kenrb@chromium.org,paulmeyer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=2220,621660

Review-Url: https://codereview.chromium.org/2363993003
Cr-Commit-Position: refs/heads/master@{#420774}
9 files changed