shill: Replace VLOG with SLOG.

This CL replaces all uses of VLOG(level) with SLOG(scope, level) with
the same verbose level and an appropriate scope for each affected
logging statement.

BUG=chromium-os:29641
TEST=Build and run unit tests. Test scope logging with ff_debug.

Change-Id: Ifdcf1faa2a309bcbd9ee369a66179ce9c7f1ad19
Reviewed-on: https://gerrit.chromium.org/gerrit/20629
Commit-Ready: Ben Chan <benchan@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
diff --git a/shill_main.cc b/shill_main.cc
index f4e06dc..b5c7699 100644
--- a/shill_main.cc
+++ b/shill_main.cc
@@ -18,6 +18,7 @@
 #include <chromeos/syslog_logging.h>
 
 #include "shill/dbus_control.h"
+#include "shill/scope_logger.h"
 #include "shill/shill_config.h"
 #include "shill/shill_daemon.h"
 
@@ -79,7 +80,7 @@
 }
 
 void DeleteDBusControl(void* param) {
-  VLOG(2) << __func__;
+  SLOG(DBus, 2) << __func__;
   shill::DBusControl* dbus_control =
       reinterpret_cast<shill::DBusControl*>(param);
   delete dbus_control;