Consider redirects to about:blank as canceling and don't flag conflicts

If one extension redirects a webrequest to a different URL (e.g. from http://foo.com to https://foo.com) and another extension redirects to about:blank, the latter wants to express that it intends to cancel the request. With this CL we give precedence to cancelling requests by redirecting to about:blank and don't flag them redirect conflicts.


BUG=111700
TEST=no


Review URL: http://codereview.chromium.org/9857009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@129117 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed