Disable noisy printf in nss_util.cc

This is printed in every browser test, and just adds noise. Switch it
to VLOG(1) so it's available when wanted.

R=rsleevi@chromium.org
BUG=339891

Review URL: https://codereview.chromium.org/148483008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@248290 0039d316-1c4b-4281-b951-d872f2087c98

crypto/nss_util.cc

@@ -437,7 +437,7 @@ class NSSInitSingleton {
   void InitializePrivateSoftwareSlotForChromeOSUser(
       const std::string& username_hash) {
     DCHECK(thread_checker_.CalledOnValidThread());
-    LOG(WARNING) << "using software private slot for " << username_hash;
+    VLOG(1) << "using software private slot for " << username_hash;
     DCHECK(chromeos_user_map_.find(username_hash) != chromeos_user_map_.end());
     chromeos_user_map_[username_hash]->SetPrivateSlot(
         chromeos_user_map_[username_hash]->GetPublicSlot());