check-webkit-style should check for extraneous newline between config.h and primary header.
https://bugs.webkit.org/show_bug.cgi?id=124821

Patch by Gergo Balogh <geryxyz@inf.u-szeged.hu> on 2013-11-29
Reviewed by Csaba Osztrogonác.

* Scripts/webkitpy/style/checkers/cpp.py:
(check_include_line):
* Scripts/webkitpy/style/checkers/cpp_unittest.py:
(OrderOfIncludesTest.test_check_line_break_after_own_header):
(OrderOfIncludesTest):
(OrderOfIncludesTest.test_check_line_break_before_own_header):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@159872 268f45cc-cd09-0410-ab3c-d52691b4dbfc