check-webkit-style should check the order of #imports as well as #includes
https://bugs.webkit.org/show_bug.cgi?id=134428

Reviewed by Dan Bernstein.

* Scripts/webkitpy/style/checkers/cpp.py:
Allow "import" in addition to "include", so that the sort order of headers in ObjC files is checked.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@170565 268f45cc-cd09-0410-ab3c-d52691b4dbfc