Web Inspector: NavigatorView should show (program) for uiSourceCodes with empty name.
https://bugs.webkit.org/show_bug.cgi?id=111691

Reviewed by Alexander Pavlov.

Source/WebCore:

Made String.prototype methods return string literal, not String object.

* inspector/front-end/utilities.js:
(String.prototype.escapeCharacters):

LayoutTests:

* inspector/debugger/navigator-view-expected.txt:
* inspector/debugger/navigator-view.html:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145048 268f45cc-cd09-0410-ab3c-d52691b4dbfc