Sort project headers in a case-sensitive way since PRESUBMIT enforces that

The PRESUBMIT check requires that the lines:

#include "third_party/WebKit/...h"
#include "third_party/skia/...h"

be sorted in that order, which requires doing a case-sensitive sort. sort-headers.py was
changed to do a case-insensitive sort in r139294 to avoid shuffling system header includes
like these:

#include <uxtheme.h>
#include <Vssym32.h>

This preserves that behavior only for system-style includes (those with <>).

Review URL: https://codereview.chromium.org/12719005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@187945 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed