Web Inspector: Make JavaScriptSourceFrame work correctly with breakpoints when uiSourceCode does not have a scriptFile.
https://bugs.webkit.org/show_bug.cgi?id=113500

Reviewed by Pavel Feldman.

JavaScriptSourceFrame now listens for uiSourceCode working copy related events and supports muting breakpoints without script file.

* inspector/front-end/JavaScriptSourceFrame.js:
(WebInspector.JavaScriptSourceFrame):
(WebInspector.JavaScriptSourceFrame.prototype._workingCopyChanged):
(WebInspector.JavaScriptSourceFrame.prototype._workingCopyCommitted):
(WebInspector.JavaScriptSourceFrame.prototype._updateScriptFile):
(WebInspector.JavaScriptSourceFrame.prototype.dispose):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@147106 268f45cc-cd09-0410-ab3c-d52691b4dbfc