variations: Replace base::MakeUnique with std::make_unique

Bug: 755727
Change-Id: I3192ab87637409da6a42b609a6a08a0b605e49bc
Reviewed-on: https://chromium-review.googlesource.com/866411
Reviewed-by: Alexei Svitkine <[email protected]>
Commit-Queue: Alexei Svitkine <[email protected]>
Cr-Commit-Position: refs/heads/master@{#529290}
diff --git a/components/variations/variations_seed_processor_unittest.cc b/components/variations/variations_seed_processor_unittest.cc
index da4cb4c5..7979379 100644
--- a/components/variations/variations_seed_processor_unittest.cc
+++ b/components/variations/variations_seed_processor_unittest.cc
@@ -17,7 +17,6 @@
 #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"
@@ -952,7 +951,7 @@
   // 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::FieldTrialList field_trial_list(
-      base::MakeUnique<base::MockEntropyProvider>(0.1));
+      std::make_unique<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