Web Inspector: "loadScript" function to load scripts via xhr
https://bugs.webkit.org/show_bug.cgi?id=110879

Patch by Andrey Lushnikov <lushnikov@chromium.org> on 2013-02-28
Reviewed by Pavel Feldman.

Create an alias for "importScript" function and use it in those cases
which assume lazy script loading.

No new tests.

* inspector/front-end/Panel.js:
(WebInspector.PanelDescriptor.prototype.panel):
* inspector/front-end/SourceFrame.js:
(WebInspector.SourceFrame):
* inspector/front-end/utilities.js:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144305 268f45cc-cd09-0410-ab3c-d52691b4dbfc