Web Inspector: Show syntax highlight for application/javascript in Resource Preview tab
https://bugs.webkit.org/show_bug.cgi?id=112355

Patch by Andrey Lushnikov <lushnikov@chromium.org> on 2013-03-14
Reviewed by Pavel Feldman.

No new tests.

Return canonical mimeType in requestContent method of
NetworkRequest.js

* inspector/front-end/NetworkRequest.js:
(WebInspector.NetworkRequest.prototype.requestContent):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145843 268f45cc-cd09-0410-ab3c-d52691b4dbfc