Fixes <http://webkit.org/b/31260>.

Fixes <http://webkit.org/b/31260>.
Web Inspector: Main Resources Other than HTML are mis-detected.

Reviewed by Tim Hatcher.

Even if the resource is a main resource, look at its CachedResource type,
because it might be an image, stylesheet, or JavaScript file, and we
want to show them all correctly.

* inspector/InspectorResource.cpp:
(WebCore::InspectorResource::cachedResourceType): Move this method out so it can be called in multiple places.
(WebCore::InspectorResource::type):
* inspector/InspectorResource.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@50905 268f45cc-cd09-0410-ab3c-d52691b4dbfc