Fix adding duplicate trials to allocator (finally)

base/metrics/field_trial.h

Index: base/metrics/field_trial.h
diff --git a/base/metrics/field_trial.h b/base/metrics/field_trial.h
index 306f0075c6657d04c6e23f95a41e8dce455e37a3..06a37a6fb05eaf5fc57e0dc953ea05ed43302a7a 100644
--- a/base/metrics/field_trial.h
+++ b/base/metrics/field_trial.h
@@ -543,6 +543,8 @@ class BASE_EXPORT FieldTrialList {
   // Allow tests to access our innards for testing purposes.
   FRIEND_TEST_ALL_PREFIXES(FieldTrialListTest, InstantiateAllocator);
   FRIEND_TEST_ALL_PREFIXES(FieldTrialListTest, AddTrialsToAllocator);
+  FRIEND_TEST_ALL_PREFIXES(FieldTrialListTest,
+                           DoNotAddSimulatedFieldTrialsToAllocator);
 
 #if defined(OS_WIN)
   // Takes in |handle| that should have been retrieved from the command line and