Reland: Stop passing raw pointers to base::Value API in c/b/chromeos and c/b/extensions

chrome/browser/prefs/tracked/pref_hash_browsertest.cc

Index: chrome/browser/prefs/tracked/pref_hash_browsertest.cc
diff --git a/chrome/browser/prefs/tracked/pref_hash_browsertest.cc b/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
index 513998b727f277aae996165a606ddf5b53dd2be5..ec49704052487b9cfd24af9c335cff4314fceb90 100644
--- a/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
+++ b/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
@@ -4,6 +4,7 @@
 
 #include <memory>
 #include <string>
+#include <utility>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
@@ -11,6 +12,7 @@
 #include "base/files/file_util.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/json/json_reader.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_base.h"
 #include "base/metrics/histogram_samples.h"
 #include "base/metrics/statistics_recorder.h"
@@ -885,9 +887,9 @@ class PrefHashBrowserTestChangedSplitPref : public PrefHashBrowserTestBase {
 
     // Drop a fake extension (for the purpose of this test, dropped settings
     // don't need to be valid extension settings).
-    base::DictionaryValue* fake_extension = new base::DictionaryValue;
+    auto fake_extension = base::MakeUnique<base::DictionaryValue>();
     fake_extension->SetString("name", "foo");
-    extensions_dict->Set(std::string(32, 'a'), fake_extension);
+    extensions_dict->Set(std::string(32, 'a'), std::move(fake_extension));
   }
 
   void VerifyReactionToPrefAttack() override {