Convert FieldTrialList to Accept a std::unique_ptr

components/variations/variations_seed_processor_unittest.cc

Index: components/variations/variations_seed_processor_unittest.cc
diff --git a/components/variations/variations_seed_processor_unittest.cc b/components/variations/variations_seed_processor_unittest.cc
index d1e9967a2e18767b6954923593a4ad4724ad7499..7703eed3b1ae1631c2f014239fc2d77dd575b1d3 100644
--- a/components/variations/variations_seed_processor_unittest.cc
+++ b/components/variations/variations_seed_processor_unittest.cc
@@ -17,6 +17,7 @@
 #include "base/feature_list.h"
 #include "base/format_macros.h"
 #include "base/macros.h"
+#include "base/memory/ptr_util.h"
 #include "base/strings/string_split.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
@@ -867,11 +868,8 @@ TEST_F(VariationsSeedProcessorTest, LowEntropyStudyTest) {
 
   // An entorpy value of 0.1 will cause the AA group to be chosen, since AA is
   // the only non-default group, and has a probability percent above 0.1.
-  base::MockEntropyProvider* mock_high_entropy_provider =
-      new base::MockEntropyProvider(0.1);
-
-  // The field trial list takes ownership of the provider.
-  base::FieldTrialList field_trial_list(mock_high_entropy_provider);
+  base::FieldTrialList field_trial_list(
+      base::MakeUnique<base::MockEntropyProvider>(0.1));
 
   // Use a stack instance, since nothing takes ownership of this provider.
   // This entropy value will cause the default group to be chosen since it's a