Web Inspector: follow up to r114116 - fixing QT test

Web Inspector: follow up to r114116 - fixing QT test
https://bugs.webkit.org/show_bug.cgi?id=83892

Reviewed by Yury Semikhatsky.

Source/WebCore:

Requesting content for the scripts exclusively via the page agent now.

* inspector/front-end/Resource.js:
(WebInspector.Resource.prototype.get content):
(WebInspector.Resource.prototype.get contentEncoded):
(WebInspector.Resource.prototype.requestContent):
(WebInspector.ResourceRevision.prototype.requestContent):

LayoutTests:

* inspector/debugger/raw-source-code.html:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@114133 268f45cc-cd09-0410-ab3c-d52691b4dbfc