[Cleanup] Remove some expired omnibox field trials.

chrome/browser/autocomplete/search_provider_unittest.cc

Index: chrome/browser/autocomplete/search_provider_unittest.cc
diff --git a/chrome/browser/autocomplete/search_provider_unittest.cc b/chrome/browser/autocomplete/search_provider_unittest.cc
index 256c1366eb36b123e6e00fd704c5342004e8872e..848e4a454979ba4f7b51d1ca51a814d1ab2f0231 100644
--- a/chrome/browser/autocomplete/search_provider_unittest.cc
+++ b/chrome/browser/autocomplete/search_provider_unittest.cc
@@ -549,10 +549,8 @@ void SearchProviderTest::ResetFieldTrialList() {
   field_trial_list_.reset(new base::FieldTrialList(
       new metrics::SHA1EntropyProvider("foo")));
   variations::testing::ClearAllVariationParams();
-  base::FieldTrial* trial = base::FieldTrialList::CreateFieldTrial(
-      "AutocompleteDynamicTrial_0", "DefaultGroup");
-  trial->group();
 }
+
 base::FieldTrial* SearchProviderTest::CreateFieldTrial(
     const char* field_trial_rule,
     bool enabled) {