trunk-tracking: in_place_resource_recorder changes
trunk-tracking: adjust for big changes from r3366

SystemRewriteDriverFactory was expanded by r3366 to do a lot of what
NgxRewriteDriverFactory used to have to do.  Take advantage of this and
simplifiy our code.
trunk-tracking: update apache_system_test for minor changes in r3369 and r3374
Merge pull request #469 from pagespeed/jefftk-update-trunk-tracking

trunk-tracking: take advantage of new functionality in system/