Web Inspector: ⌘G / ⇧⌘G text search does not working after closing find banner

Web Inspector: ⌘G / ⇧⌘G text search does not working after closing find banner
https://bugs.webkit.org/show_bug.cgi?id=181280
<rdar://problem/36291175>

Patch by Joseph Pecoraro <pecoraro@apple.com> on 2018-01-04
Reviewed by Matt Baker.

* UserInterface/Views/ContentBrowser.js:
(WI.ContentBrowser.prototype._findBannerDidHide):
When the find banner is hidden trigger a new ContentView method,
searchHidden instead of the destructive searchCleared. This allows
most content views (text editors, DOM tree, Network Headers view)
to keep their populated search results.

* UserInterface/Views/ContentView.js:
(WI.ContentView.prototype.searchHidden):
* UserInterface/Views/LogContentView.js:
(WI.LogContentView.prototype.searchHidden):
By default searchHidden does nothing. The Console's LogContentView
treats the find banner differently and clears its search results.

* UserInterface/Views/TextEditor.js:
(WI.TextEditor.prototype.searchCleared):
Modernize some code while working in this area.

* UserInterface/Views/Main.css:
(.bouncy-highlight):
Ensure black text on yellow background in the bouncy highlight. In the
DOM Tree it could have been white if the find banner was closed.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@226415 268f45cc-cd09-0410-ab3c-d52691b4dbfc