Resolve conflict in chrome://flags and field trial config.

chrome/common/variations/variations_util.cc

Index: chrome/common/variations/variations_util.cc
diff --git a/chrome/common/variations/variations_util.cc b/chrome/common/variations/variations_util.cc
index cd5062d6eaab877a2e5e5680075902a4ccde9443..dc63a292ee7628202af49601b5cba56b518916c6 100644
--- a/chrome/common/variations/variations_util.cc
+++ b/chrome/common/variations/variations_util.cc
@@ -92,6 +92,13 @@ void AssociateParamsFromFieldTrialConfig(const FieldTrialTestingConfig& config,
     base::FieldTrial* trial =
         base::FieldTrialList::CreateFieldTrial(group.study, group.group_name);
 
+    if (!trial) {
+      DLOG(WARNING) << "Field trial config study skipped: " << group.study
+                    << "." << group.group_name
+                    << " (it is overridden from chrome://flags)";
+      continue;
+    }
+
     for (size_t j = 0; j < group.enable_features_size; ++j) {
       feature_list->RegisterFieldTrialOverride(
           group.enable_features[j], base::FeatureList::OVERRIDE_ENABLE_FEATURE,