Use files served via http for popup blocker test

The test for the correct referrer only works by accident. file URLs
shouldn't have referres.

BUG=none
R=bauerb@chromium.org

Review URL: https://codereview.chromium.org/139283002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244862 0039d316-1c4b-4281-b951-d872f2087c98
Sanitize the referrer when loading a serialized navigation entry

Pickled entries might contain inconsistent data and trigger the check in the
network stack.

BUG=334125
R=marja@chromium.org, sky@chromium.org

Review URL: https://codereview.chromium.org/137893006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244863 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244863