Fix inverted early return check in variations simulation code.

BUG=394855

Review URL: https://codereview.chromium.org/438163004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287694 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/metrics/variations/variations_service.cc

@@ -571,7 +571,7 @@ void VariationsService::OnResourceRequestsAllowed() {
 void VariationsService::PerformSimulationWithVersion(
     scoped_ptr<variations::VariationsSeed> seed,
     const base::Version& version) {
-  if (version.IsValid())
+  if (!version.IsValid())
     return;
 
   const base::ElapsedTimer timer;