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..3ce0b097160f89a6bcb17c9fd7246a6456237141 100644
--- a/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
+++ b/chrome/browser/prefs/tracked/pref_hash_browsertest.cc
@@ -885,9 +885,9 @@ 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 {