Remove BootControlInterface from FilesystemVerifierAction.

update_engine now only runs FilesystemVerifierAction after DownloadAction,
the partition paths are already set in InstallPlan, so we no longer need
BootControlInterface to get partition paths in FilesystemVerifierAction.

Test: ./update_engine_unittests
Test: applied an update in edison
Bug: 26972259

Change-Id: I9d439688a21e4e42be88a4c5accf731ce64d2d6f
diff --git a/update_attempter.cc b/update_attempter.cc
index 751eb52..6dd1483 100644
--- a/update_attempter.cc
+++ b/update_attempter.cc
@@ -638,7 +638,7 @@
                                      system_state_->hardware())),
           false));
   shared_ptr<FilesystemVerifierAction> filesystem_verifier_action(
-      new FilesystemVerifierAction(system_state_->boot_control()));
+      new FilesystemVerifierAction());
   shared_ptr<OmahaRequestAction> update_complete_action(
       new OmahaRequestAction(
           system_state_,