Build fix.

* platform/graphics/avfoundation/objc/WebCoreAVFResourceLoader.h:
Add missing #include and forward declaration.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148271 268f45cc-cd09-0410-ab3c-d52691b4dbfc
And again, with the correct case this time.

* platform/graphics/avfoundation/objc/WebCoreAVFResourceLoader.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148272 268f45cc-cd09-0410-ab3c-d52691b4dbfc