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/mm1_modem_proxy.cc b/mm1_modem_proxy.cc
index 4ba6541..64a8a4d 100644
--- a/mm1_modem_proxy.cc
+++ b/mm1_modem_proxy.cc
@@ -6,7 +6,8 @@
 
 #include <base/logging.h>
 
-#include "cellular_error.h"
+#include "shill/cellular_error.h"
+#include "shill/scope_logger.h"
 
 using std::string;
 
@@ -29,7 +30,7 @@
                         Error *error,
                         const ResultCallback &callback,
                         int timeout) {
-  VLOG(2) << __func__ << "(" << enable << ", " << timeout << ")";
+  SLOG(Modem, 2) << __func__ << "(" << enable << ", " << timeout << ")";
   scoped_ptr<ResultCallback> cb(new ResultCallback(callback));
   try {
     proxy_.Enable(enable, cb.get(), timeout);