Web Inspector: Improve user experience of advanced search panel closing.

Web Inspector: Improve user experience of advanced search panel closing.
https://bugs.webkit.org/show_bug.cgi?id=76983

Reviewed by Pavel Feldman.

Added close button to search panel.
Esc now closes the panel even when search filed has focus.

* English.lproj/localizedStrings.js:
* inspector/front-end/AdvancedSearchController.js:
(WebInspector.AdvancedSearchController.prototype.close):
(WebInspector.SearchView):
(WebInspector.SearchView.prototype._onKeyDown):
(WebInspector.SearchView.prototype._closeButtonPressed):
* inspector/front-end/inspector.css:
(.search-view .search-panel):
(.search-view .search-panel button.search-close-button):
* inspector/front-end/inspector.js:
(WebInspector._escPressed):
(WebInspector.closeDrawerView):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@105969 268f45cc-cd09-0410-ab3c-d52691b4dbfc